Hose extension for portable air conditioner: Why You Can’t Lengthen the Exhaust Hose of Your Portable Air Condition – My Home Climate

Flexible Exhaust Hose For Portable Air Conditioner

Flexible exhaust hoses for portable air conditioners are available in a variety of lengths and diameters. The most common diameter is four inches, but hoses with a five-inch diameter are also available. The length of the hose should be at least four feet longer than the height of the window in which the air conditioner will be placed.

When you buy a portable air conditioner, you’ll want to make sure that it comes with a flexible exhaust hose. This allows you to direct the hot air away from the unit, and out of the room. Most portable air conditioners come with an exhaust hose that is about five feet long.

However, there are some models that come with hoses that are up to 20 feet long. If you need a longer hose, you can purchase one separately. Flexible exhaust hoses are made of durable material that won’t tear or leak easily.

They’re also easy to install – just attach the hose to the exhaust port on your portable air conditioner and secure it in place with the included clamp. Once the hose is installed, you can position the other end near a window or door so that hot air can be released outside. If you live in an apartment or other small space, a portable air conditioner can be a great way to stay cool during summer months.

Just make sure to choose a model with a flexible exhaust hose so that you can direct hot air out of your home and into the outdoors!

Credit: www.amazon.com

Page Contents


Can You Use Flexible Duct for Portable Air Conditioner?

Yes, you can use flexible duct for a portable air conditioner. Just make sure that the duct is properly sealed and insulated so that it doesn’t leak any cold air.

Can You Run a Portable Air Conditioner Without an Exhaust Hose?

No, you cannot run a portable air conditioner without an exhaust hose. The exhaust hose is necessary to vent the hot air that the air conditioner produces outside. If you do not have an exhaust hose, the hot air will simply recirculate back into the room, making the air conditioner less effective and potentially damaging it over time.

What Size is a Portable Ac Exhaust Hose?

A portable AC exhaust hose is typically 5 to 6 inches in diameter. Some hoses may be slightly larger or smaller, but this is the general range. The length of the hose will vary depending on the model of AC unit, but most are between 3 and 6 feet long.

Can You Use a Dryer Vent Hose for a Portable Air Conditioner?

You can use a dryer vent hose for a portable ac, but there are some things to keep in mind. The biggest thing is that the dryer vent hose should be able to fit snugly over the exhaust port on the back of the air conditioner. If it’s too big, it won’t create a tight seal and hot air will escape, making the unit less efficient.

Additionally, make sure the hose isn’t kinked or bent, as this can also impede airflow.

Universal Exhaust Hose for Portable Air Conditioner

A portable air conditioner is a great way to keep your home cool during the summer months. However, one of the most important parts of a portable air conditioner is the exhaust hose. The exhaust hose helps to vent hot air from the unit outside, and it also helps to keep the unit from tipping over.

A universal exhaust hose for a portable air conditioner is typically about five feet long and can be attached to any standard window. Most hoses come with adapters that allow you to attach it to different types of windows. If you don’t have a window that’s big enough to fit the exhaust hose, you can also use an adapter to connect it to a dryer vent.

Portable Air Conditioner Exhaust Hose Extension

If your portable air conditioner doesn’t have an exhaust hose long enough to reach an appropriate window, you can buy an extension hose. These hoses are typically made of PVC and fit most standard portable AC units. They come in a variety of lengths, so you can find one that will fit your needs.

Most importantly, make sure the diameter of the hose is compatible with your AC unit! Installing the extension hose is relatively simple. First, measure the length you need and cut the hose to size with a sharp knife.

Next, use duct tape or a similar product to attach the hose to the exhaust port on your AC unit. Finally, insert one end of the hose into the window and secure it in place with more duct tape or another adhesive product. That’s it – you’re ready to enjoy cool, comfortable air!

If you live in an area with humid summers, a portable air conditioner can be a lifesaver. But if your AC unit doesn’t have a long enough exhaust hose to reach an open window, don’t despair – you can buy an extension hose that will do the trick! Just make sure to get one that’s compatible with your particular AC unit and follow these easy instructions for installation.

5 In. X 6.5 Ft. Non-Insulated Flexible Exhaust Hose for Portable Air Conditioner

If you’re looking for a flexible exhaust hose for your portable air conditioner, the 5 In. x 6.5 Ft. Non-Insulated Flexible Exhaust Hose is a great option.

This hose is made of durable materials and is designed to be used with portable air conditioners that have a diameter of 5 inches. The hose is 6.5 feet long, making it easy to route through windows or other openings in your home.

What Size Exhaust Hose for Portable Air Conditioners?

Most portable air conditioners come with an exhaust hose that is five feet long. If you need a longer hose, you can purchase one at a hardware store or online. The most important thing to consider when choosing a size is the diameter of the hose.

The diameter should be slightly smaller than the outlet on the back of the air conditioner. Otherwise, the air will not flow properly and your unit will not work efficiently.

Portable Air Conditioner Exhaust Hose Coupler

If you have a portable air conditioner, you know that one of the most important parts is the exhaust hose. The exhaust hose is what allows the unit to vent hot air outside, and without it, your air conditioner wouldn’t work. One thing you might not know about the exhaust hose is that there is a coupling that connects it to the AC unit.

This coupling is essential for proper operation of the AC unit, and if it becomes damaged, it can cause all sorts of problems. The good news is that replacing a damaged portable air conditioner coupling is easy to do and only takes a few minutes. In this blog post, we’ll show you how to replace a damaged or broken AC coupling in just a few simple steps.


If you have a portable air conditioner, chances are you’ve also struggled with finding a way to properly vent it. Traditional methods often involve duct tape and cutting holes in your window, neither of which are ideal solutions. But there’s a new product on the market that promises to make venting your portable AC unit easier than ever before.

The Flexible Exhaust Hose is a simple but genius invention that attaches to the exhaust port of your portable AC unit. And can be routed through any opening in your home, whether it’s a window, door, or even just a crack in the wall. The hose is made of durable material that can be bent and shaped to fit any space, and it comes with all the necessary hardware for easy installation. Best of all, the Flexible Exhaust Hose is totally affordable, so you can save yourself the hassle (and expense) of duct tape and window repairs.

If you’re looking for an easy way to vent your portable air conditioner, this is definitely the product for you!

How to keep a Portable Air Conditioner Hose from falling out

Your portable air conditioner hose keeps falling out? The connection of the exhaust hose and portable AC or between hose and window is not secure enough? How do you ensure your portable air conditioner hose stays in place?

In this article, we’re having a look at a few simple things you can do to prevent your air conditioner hose from falling out.

A portable AC hose can fall out at either one of its ends: Either directly at the portable AC connection, or it can slip out from the window.

Quick answer: You can fix your portable air conditioner and stop it from falling out by securing it with temperature and humidity-resistant HVAC duct tape. In the long run, getting the original exhaust hose of your portable air conditioner is the best choice, if it has connection pieces you can plug in without glue.

Why portable air conditioner hoses can fall out

Portable air conditioner hoses can fall out. And that’s something very annoying. Normally, a portable AC only relies on fixed part connectors to connect the exhaust hose to the window.

With fixed part connectors I am referring to the plastic ends of the hose that you can connect to the window or the portable AC exhaust without the need for any glue.

These plastic connectors come with most portable air conditioners. As long as you set everything up correctly, the hose should not fall out.

However, if the situation at your home is not a “standard situation”, connecting the hose might turn out troublesome.

Examples of non-standard situations are:

  • your window sits at an elevated level
  • you don’t have space right below your window so your portable AC has to stand at a further distance
  • you want to protect your portable air conditioner from kids, so you place it on a high surface

In all of these cases, you have to stretch the hose and might not be able to connect the hose without causing it to slip out.

What most people do wrong when fixating the air conditioner hose

Oftentimes people fix the portable air conditioner hose with common duct tape, which does not always work.

The problem is that the hose carries warm air outdoors. This means that the hose itself is heated up whenever the portable air conditioner runs.

The exhaust warmth causes the duct tape glue which attaches the hose and window or hose and portable AC  to melt. The hose finally slips off.

Good quality portable air conditioners come with hoses and built-in connectors that do not rely on friction or glue to hold together. Instead, they come with clever connection mechanisms to plug in the hose tightly. The mechanisms naturally keep the hose from falling out.

How to prevent your portable AC hose from falling out

Now that we’ve discussed all the problems with air conditioner hoses and what causes them to fall out, let’s look at the steps you can take to ensure you don’t have to worry about your AC hose falling out anymore.

Use HVAC duct tape to fixate your hose

The simplest fix is obviously to tape the hose to the air conditioner using duct tape. Here, you have to make sure that you use good quality duct tape which is suited for varying temperatures.

There exists so-called HVAC duct tape for extreme weather, humidities, and temperatures.

Personally, I recommend this professional-grade HVAC tape (click here to view it on amazon). This tape is very sticky, so you might need a friend to help you apply it. But it will be worth it and keep your portable air conditioner hose from falling out!

Use original hose adapters

Taping the hose using HVAC tape works perfectly fine. However, it oftentimes doesn’t look clean and is a “hack”.

If you want a clean-looking solution instead, the best way to fix your problem is to use the original hose adapter (transition piece) of your portable air conditioner.

Of course, this only makes sense if your original hose adapters were working fine, but are broken. If the original connection parts of your portable AC don’t hold the hose firmly, it does not make sense to rebuy them.

The advantage of using original parts is that you don’t need extra gear such as HVAC tape or a hose kit. Also, no shortcut solution will hold the hose as reliably as the original parts (at least usually).

The original parts are designed and built to fit your portable air conditioner and hose exactly. Original parts are specific to each mode, which might make them hard to find.

You can look up your air conditioner brand’s online shop and see if they have replacement parts available. Usually, if you don’t find replacement parts online, the air conditioner companies are willing to help you and place a custom order just for you.

Sometimes, you can even get free replacements! But that’s probably only if you are lucky. It depends on the company you are contacting.

Because these replacement parts fit your portable air conditioner perfectly, you don’t need to use glue or tape. Everything should hold together on its own.

Use an air conditioner hose kit

If your original hose adapters (or other connection parts) are lost or broken and additionally you don’t find the original replacements online, you can use an air conditioner hose kit.

An air conditioner hose or window kit is a generic kit that comes with one-sized parts that should fit most portable air conditioners.

Here’s a well-rated portable AC window kit (click here to view it on amazon) which you can use to set up a new window vent.

Additionally, if your hose is broken, you can get this air conditioner hose (click here to view it on amazon). Just make sure the diameter of 5.9 inches fits your portable AC.

Manufacturers oftentimes produce these hose kits cheaply. Most of the hose kits you find online are of low quality.

You will find a big difference in quality when you compare the original parts with the hose kit parts.

Of course, there are exceptions. It is important to only buy highly-rated hose kits with hundreds or thousands of positive customer ratings. The portable AC window kit and the air conditioner hose are both well-rated and you can’t go wrong with them.

So, if the hose kits I have picked out are not suitable for your portable air conditioner (for example the hose diameter differs), then you should look for something with a similar rating.

Use a bungee cord to hold up your hose

Your portable air conditioner exhaust hose oftentimes falls out because the hose is pulling itself off because of its own weight.

This only happens if one end of the hose is significantly higher than the other end.

You can fix this by tying a bungee cord with both ends to your curtain rod. Alternatively, you can install two metal hooks on the wall on both sides of your window. You can then put the air conditioner hose on top of the bungee cord loop. 

The bungee cord lifts the hose so a part of the “pull-off force” is distributed to the bungee cord instead of the air conditioner hose connection pieces.

This can make a significant difference and might even prevent your portable air conditioner hose from falling out.

The downside is that it looks rather “experimental”. But as long as you are using the portable air conditioner in a room that does not have visitors too often, or in a cabin, looks don’t matter.

There, holding up your air conditioner hose with a bungee cord may be a good, almost free, and glueless solution.

Advanced tips to secure your air conditioner hose

Since we have already covered lots of ground on how to prevent your portable air conditioner hose from falling out, let’s have a look at a few more fine-grained details.

First off, try to avoid stretching the hose too much. Portable air conditioner hoses should always sit loosely in the window and in the connector of the portable AC. There should never be any tensions and pull-off forces.

If you have to stretch your portable air conditioner hose because of length limits, try buying a new, longer hose. Alternatively, change the placement of your portable air conditioner. Hoses under tension will almost always fall out.

Also, always connect the hose to the lowermost part of the window. This reduces the length of the hose necessary to connect the window and AC. And also, using the lowermost part of your window for the exhaust connection ensures that the force pulling down the hose is minimized. The higher your exhaust connection is located, the greater the pull-off force.

Accordingly, the hose should support as little of its own weight as possible. You can accomplish this by using a bungee cord to hold the hose up. It does not even have to be a bungee cord. Anything that prevents the hose from hanging in the air will prevent your portable air conditioner hose from falling out.


The quickest and simplest solution to fix your portable air conditioner hose falling out is to duct tape it with HVAC tape.

This should solve 95% of the issues. If you still have problems with your hose slipping out, try to rebuy the original connection parts or a portable AC hose kit.

Ensure that the hose does not have to support its own weight, so it doesn’t pull itself off.

large selection and everything in stock

Mobile air conditioners are ideal for those who often move and want the comfortable temperature to “move” with them. Today, a person in the modern rhythm of life appreciates mobility in everything. Air conditioners of mobile type (also called mobile) are easily moved and it will not be difficult to take them with you when moving to a new room, or just on a trip to the country.

Mobile air conditioner application
Mobile air conditioners are suitable for any small space up to 35 sq.m. Also, air conditioners of this type will be an excellent solution if, for one reason or another, construction work is not desirable in the room, for example, if you do not want to hurt or modify the interior.

Mobile air conditioner device
Mobile air conditioner is a monoblock in which a flexible corrugated hose serves as a means of removing warm air from the room, then drainage is drained to the condenser heat exchanger, sprayed through a corrugated heat-removing hose to the street.

Mobile air conditioners: advantages and disadvantages

Pluses :

  • no special and complex installation: we buy it and just plug it into the socket;
  • remote control option;
  • mobility: easy to move, compact;
  • the ability to not only cool, but also heat the room.

Cons :

  • work on the area – up to 35 sq.m;
  • the temperature is not maintained accurately enough;
  • relatively high noise figure – from 40 to 50 dB;
  • The point of heat release is limited in distribution – 2m.

It is important to note that no matter how tempting the advantages of these air conditioners may seem – mobility and small dimensions – these devices were developed in China, and the emphasis was placed precisely on mobility, and not on quality; therefore, before giving preference to this particular air conditioning device, think about how modern split systems are more reliable and better.

Installation of mobile air conditioners
As mentioned above, one of the advantages of mobile air conditioners is the ease of installation. You do NOT need to hire professionals. In the desired room, we connect the air conditioner to the outlet, and it is ready to work!

When installing and operating a mobile air conditioner, it is important to follow a few rules:

  • The air conditioner is connected only to a grounded socket;
  • Do not connect the air conditioner through an extension cord or adapter, only directly to the mains;
  • Do not operate the air conditioner with the front panel or grille removed;
  • Do not earth the appliance through the gas pipe;
  • The air conditioner fuse is not installed on the ground wire or neutral, as there is a possibility of electric shock;
  • There should be no obstacles for air circulation around the mobile type split system, the distance from the air conditioner to any objects should be at least 50 cm.

Maintenance of mobile air conditioners
Timely troubleshooting of the mobile air conditioner will allow you to enjoy its operation for a long time. There are no features in the service of mobile air conditioners. It is advisable to carry out prevention twice a year, before the start of each season, which involves increased activity in the use of air conditioning.

is it worth buying a mobile air conditioner?

In summer, the demand for floor-mounted mobile air conditioners rises sharply: in fact, unlike split systems, they do not require complex installation and allow you to start cooling the room immediately after being plugged into the outlet. The purchase of a mobile air conditioner is often spontaneous, as an ambulance in case of heat or smog, when the buyer does not fully understand the features of the device, operation and selection criteria for these devices. We figure out whether it is worth investing in a mobile air conditioner, how to choose it, and whether everything is so simple with installation and mobility.

What is a mobile air conditioner and how does it differ from a split system

indoor unit with controls and evaporator.

A mobile air conditioner is a monoblock, where the heat exchanger (evaporator), fan, compressor, and condenser are located: that is, everything needed for “cold production” is placed in one housing. Due to this, mobile air conditioners have a rather high noise level compared to split systems.

In split systems, hot air and condensate formed as a result of heat exchange are removed from the outdoor unit, which is located outside the refrigerated room. A mobile air conditioner blows hot air from the side opposite to the cold air outlet. Therefore, hot air must be removed from the room using the hose included in the kit, one end of which is attached to the hot air outlet in the device case, and the other to where the air is removed: into the window sash, into the ventilation shaft. Ways to output the hose will be considered at the end of the review.

Let’s make a reservation that by mobile air conditioners we mean only devices with a compressor and refrigerant, as well as with a corrugated hose (cuff, trunk, sleeve, pipe, branch pipe) for air removal: all kinds of advertised mobile air conditioners without corrugations are a marketing bait for selling modern and good … fans with the function of humidifying the air.

You can put containers with ice in a water tank, write in an advertisement that the air is driven through the cold and this cools the room by 6-7 degrees, call it all a mobile air conditioner, an air cooler and even a climate complex, but this does not make the device ceases to be a humidifier fan.

There are also models to which two air ducts can be connected: one will take air from the street, the other will take it out there, but this is rare. An example is the CoolMobile 24. Hoses are more difficult to install, the appearance of the device is more intricate, and mobility within the premises is reduced to zero, but this solution has the advantage of greater performance and energy efficiency. And yet such air conditioners are more often used in offices.

In fairness, we say that there are mobile split air conditioners, consisting of two units connected by a hose. This is, for example, the Trotec PAC 4600 model: the compressor can be put on the balcony, and the evaporator in the floor housing remains in the room. But in this case, it is necessary to solve the question of where and how to bring the connecting hose out.

Advantages of mobile air conditioners

  • No need for professional installation
  • Possibility of installation where it is impossible or impractical to install a split system and bring its outdoor unit outside (for example, in a rented apartment, in a historical building, etc.)
  • Ability to use one device in the city and at the cottage (loaded – taken – turned on – working)
  • An urgent solution to the problem of heat and stuffiness, if you did not have time to install a split system in advance

Disadvantages of mobile air conditioners

There are many disadvantages – and all of them are due to the design of mobile air conditioners.

Due to the need to bring the hose outside, the mobility of the air conditioner within the same room is severely limited. So, if the corrugation is displayed out the window, the air conditioner can only stand next to it and nothing else. In addition, the device can only be connected to a grounded outlet (manufacturers do not recommend using extension cords). That is, mobility means the ability to easily transport the device to another room or to another apartment (house, office).

Sellers’ assurances that a mobile air conditioner, unlike a split system, does not violate the appearance and design of the room is not true. No matter how cute the design of the device, the corrugation is more striking and not only looks alien, but also steals space in the room. In addition, when the air conditioner is running at full power, it can get quite hot.

All portable air conditioners operate with high noise levels. Expensive models that have compressor soundproofing can operate with a minimum noise level of about 45 dB (in night mode), but this is also a lot to, for example, sleep nearby. For comparison: quiet modern refrigerators have a maximum noise level of 39-41 dB, and good split systems in night mode – 21-23-25 ​​dB. If there is no soundproofing of the compressor, then a mobile air conditioner can have a noise level of up to 60 dB or more, which is comparable to the noise of a bag vacuum cleaner at low power. An important nuance: if manufacturers and sellers usually report the maximum noise level of the device (hair dryer, refrigerator, vacuum cleaner), then in the case of mobile air conditioners, the minimum level is usually indicated in a conspicuous place, and the maximum should be sought in the technical documentation of the model.

Mobile air conditioners are quite heavy: from 20 to 45-50 kg. It is quite convenient to move them along the plane on wheels, but not everyone can carry them, for example, up the stairs.

It used to be that mobile air conditioners were an inexpensive option compared to split systems. However, in recent years, many budget Chinese split systems have appeared on the market, which, even with installation, cost about as much as a good expensive mobile air conditioner. But at the same time, the split system makes less noise, cools more efficiently and does not have other disadvantages of a “mobile phone”. And if you add to its cost the cost of an efficient and aesthetic way of removing hot air (for example, ordering and buying an insert to fit the size of your window sash), then it will turn out not so profitable.

Mobile air conditioners have high energy consumption. Since the removal of hot air often becomes a problem and is not organized correctly (the end of the corrugation is often simply put into the window sash), part of the heat gets back into the room, and cold losses are inevitable through the open window. If the hose is stretched too much, then the cooling efficiency also decreases due to the greater air resistance. Accordingly, in these cases, the mobile air conditioner needs more time to significantly lower the air temperature in the room, with the cooling of which the split system would cope faster. In addition, mobile air conditioners are not inverter, so their performance is lower than that of inverter split systems (and there are more and more such models and they are becoming more affordable). True, some mobile air conditioners use motion sensors to determine if there is someone in the room and whether it needs to be cooled more, and switch to the minimum mode if no one is there: this saves energy.

The liquid that condenses as a result of heat exchange, in low-cost models, is drained into a sump in the housing, and this water must be poured out periodically (in split systems, the condenser is brought outside). In modern advanced mobile air conditioners, moisture is removed to the outside along with hot air.

Functions of mobile air conditioners

With all these disadvantages, a mobile air conditioner sometimes remains the only possible solution – and then you need to decide on a model. When choosing, be sure to take into account your own sensitivity to noise and your willingness to endure it (or turn off the device at night, because the night mode most often does not save), think about the output of the corrugations and understand what functions, in addition to air cooling, you need. These can be heating, dehumidification, operation in recirculation mode (in other words, a fan), air purification using dust and catalytic filters, ionization and aromatization of air, air flow direction adjustment, self-diagnosis function, on and off timer, auto-restart on shutdown and recovery power supply and at the end of the work cycle, motion sensor, automatic mode to maintain the set temperature, remote control or remote control – and the price of the model will depend, among other things, on its capabilities.

How to calculate the required power of a mobile air conditioner

Air conditioners use the most electricity in cooling (not heating) mode, so the required power consumption is calculated for the purpose of cooling the room. The power parameter for air conditioners – both mobile and others – is marked not in kilowatts, but in BTU (British thermal unit, or BTU, British thermal unit) per hour. BTU corresponds to 0.293 Wh (usually rounded up to 0.3 Wh). For example, power 9000 BTU / h (BTU / h) is approximately equal to 2. 7 kW, if translated into the usual system of measures. Household air conditioners have a capacity of 7000, 9000, 10000, 11000, 12000 BTU / h, but this number is usually divided by 1000 – and as a result, the power ratings of the air conditioners were “7”, “9”, “10”, “11”, “12 “. The higher this power rating, the larger the area of ​​\u200b\u200bthe room served by the air conditioner. 1 kW is conventionally calculated for 10 m² of area with a ceiling height of 2.5 m, that is, the “nine” will cope with cooling a room with an area of ​​20-25 m². The figures are conditional, since this approximate calculation does not take into account higher ceilings, the direction of the world that the window faces, the number of windows, the temperature outside the window, the number of people in the room – all this affects heat and cold losses. When choosing a split system, a very approximate calculation looks like this:

  • “7” – 2.1 kW – up to 20 m²
  • “9” – 2.7 kW – up to 25 m²
  • “10” – 3 kW – up to 30 m²

It must be understood that the split system excludes the return of hot air blown out by the device into the room (and when using a mobile air conditioner, this can be minimized, but not always completely eliminated) and it does not have a heating corrugation. Therefore, a mobile device should be chosen with a good (30-40 percent) power reserve, and also focus on the brand’s reputation: for inexpensive noname models, anything can be “drawn” in the power marking. By the way, you can find real measurements of the power and noise level of a mobile air conditioner in our review of one of the Electrolux models.

How to bring the mobile air conditioner hose out the window

windows are a bad idea. The hose outlet kit included in the kit most often does not fit the dimensions of the window sash. However, if the option with a cover for a window sash offered by manufacturers of mobile air conditioners fundamentally suits you, then you can order such a cover of the right size on marketplaces with the ability to adjust it to your dimensions. It is easy to find it by the keywords “window seal for a mobile air conditioner with a cuff”, when choosing, you need to take into account the diameter of the corrugation and the hatch for it in the seal (duct diameter) and the length of the cover (3 or 4 meters). The kit usually includes a cover made of dense material and Velcro on an adhesive basis. The cover is attached to the frame with adhesive tape and tightened to fit the sash. It is important that this entire structure can be moved to another room, and the cover can be machine washed.

Sometimes the manufacturer offers not a cover, but an insert in the window (this solution was implemented in the Electrolux air conditioner we tested), but it is more suitable for sliding frames, which are not very popular in the Russian Federation. Such an insert (bar) can also be bought separately, choosing the most suitable one in terms of parameters: it is searched in search engines for the words “bar for a mobile air conditioner”.

It is possible to make an insert-frame made of PVC with a hole for the diameter of the air duct to order and precisely to the dimensions of the window sash. The hole provides a hose holder and a check valve that prevents hot air from entering the room. The frame is gently inserted into the window opening and fixed with clips, and if necessary, it can be easily removed. The disadvantages of this design are only the price and the impossibility of using it in a window of other dimensions (plus a decrease in insolation). The window sash itself will be open when the air conditioner is in use, but can be easily closed when the corrugation is detached.

Craftsmen offer their options. It’s good when it’s just an independent frame production, but there are also quite barbaric and applicable solutions only for your own home. For example, a hole for the size of the air duct is cut out in the plastic part of the balcony door, and sometimes the walls are ditched. Both are, in fact, holes on the street.

The simplest and most inexpensive way is to glue Plexiglas with a hole sawn to the diameter of the air duct on the open window frame. You can order plexiglass according to the frame size (with an allowance of 1-1.5 cm on all sides) and a technical hole in any workshop that deals with furniture, advertising structures, etc., or from a private craftsman.