How To Vent A Portable Air Conditioner Without A Window?

Venting the portable air conditioner via a window isn’t always an option. Especially if you have to cool the cellar or the room is located inside.

In this scenario, you will need to vent your air conditioner somewhere else.

Let’s explore some portable air conditioner venting options without a window. To be honest, venting a portable air conditioner without a window is very challenging but not impossible.

How To Vent A Portable Air Conditioner Without A Window?

I will look at several ways to vent the portable air conditioner in room without a window:

  • through a wall
  • through a dryer vent
  • through a ceiling or drop ceiling
  • into a cold air return
  • through a bathroom fan
  • into another room
  • into the crawlspace
  • through a door

Can You Vent A Portable AC Through A Wall?

Yes, even in a situation when the portable air conditioner can not be vented thru a window or door, it can be vented through the wall.

Most rooms, however, do not have 6-inch-diameter holes in the walls. If you wish to install an air conditioner through the wall, you must first cut a hole in the wall.

You can make a hole in the wall if you are a DIY geek and own a power tool. The opening should have the same size as the line that vents the portable air conditioners. You may also install an air conditioner designed to go through walls.

This approach is most commonly utilized for portable air conditioners with a single hose. Although two-hose portable air conditioners are much more energy-saving, no one enjoys putting that many holes in the walls.

Before beginning the drill, select the appropriate wall for the vent. Reinforced steel walls, for example, are a terrible option since they can only be drilled through by an expert.

Don’t go for thicker walls. A portable air conditioner vented via a thin wall constructed of low-density concrete is ideal for a room with no windows.

Read more: How To Vent A Portable Air Conditioner Through A Wall

Can You Vent A Portable Air Conditioner Through A Dryer Vent?

While it is feasible to vent a portable air conditioner via a dryer vent, most companies and professionals advise against it. This is due to the fact that dryer vents are often smaller in size than the exhaust pipe on an air conditioner. Inserting the hose further into the dryer vent will need a large amount of strength.

Nevertheless, many homeowners have attempted this method and found it to be effective. If you have a dryer at home, you should also check it out, particularly if it is the only viable choice. You only need to verify that the diameter of the dryer vent is big enough to permit hot air to travel easily through.

Before attaching the AC hose to the dryer vent, ensure the dryer can efficiently remove hot air. Alternatively, heat could accumulate in the system and start a fire. Even after expelling the air conditioner through the dryer vent, you should keep an eye on both the air conditioner and the dryer to ensure they are functioning properly.

Can You Vent A Portable Air Conditioner Through A Ceiling Or Drop Ceiling?

Yes, you can vent a portable air conditioner via the ceiling, assuming you don’t have a window but do have a drop ceiling.

The drop ceiling is required in this case. They are not found in the majority of modern homes. Drop ceilings are common in high-ceilinged older homes.

Ceiling venting is often used in workplaces. Offices frequently feature a drop ceiling that isn’t being used. Cubicle workplaces, for instance, may get rather hot in the summer. If the present air conditioning system (often central air conditioning) is insufficient, you can utilize a portable 10,000 BTU air conditioner and exhaust it via the ceiling.

A specific drop ceiling ventilation kit can be used to insert the venting line. These may increase the length of the hose by up to ten feet and are versatile, fitting any portable air conditioner.

Overall, it’s useful for rooms without windows, although the vent arrangement isn’t particularly appealing.

This approach is commonly employed in server rooms since these facilities are typically devoid of windows, necessitating the implementation of alternate sources of airflow.

Simply drill a hole in the ceiling panel large enough to accept the exhaust line to vent the portable air conditioner via a drop ceiling.

Can You Vent Portable Air Conditioner Into A Cold Air Return?

You can try to vent your portable AC into the cold air return, but it is not a good idea. This is due to the fact that it will make the central cooling system work considerably more difficult.

Cold air returns are generally found on internal walls down to the ground or low on the walls. To ensure adequate air circulation in the house, help ensure that cold air return vents are not obstructed or concealed by furniture.

The air in and out of your house is inhaled and exhaled by the HVAC system. This airflow should be balanced in order for the furnace to function properly and the house to heat uniformly.

Cold air returns allow the furnace to breathe the air in the house. These registers are generally placed near the ground in various places throughout your house to catch cold air that descends to the floor. When hot air is introduced to a room, the cold air that was previously present in that room is forced into the cold air returns.

Once within the cold air returns, the air goes via a duct back to the furnace, where it will be purified, warmed, and returned to the house to warm it.

When your portable air conditioner discharges heat into the return vent, that heat is absorbed by the house’s central air conditioning system. To remove excessive heat from the house, your central air conditioning system would have to work extra hours.

Essentially, your air conditioner will have to operate twice as much to remove the heat from the room you’re chilling with the portable air conditioner.

Nonetheless, if you can find no other choices for venting straight outside, this approach can be effective. If the central air conditioning system has the ability to extract additional heat, there should be no problems.

Prior to actually doing something like this, speak with an HVAC specialist.

In any scenario, venting a portable air conditioner through a return vent should only be used as an interim option while you work on installing proper venting.

Can You Vent Portable Air Conditioner Through Bathroom Fan?

Portable air conditioners are cooling systems that may be moved from one place to another. They are self-contained devices that do not need to be permanently installed. You can vent your portable air conditioner through the exhaust fan in your bathroom.

After you’ve placed the portable air conditioner where you want it, run the exhaust line through an entrance to the exterior to vent warm air out of the room.

To be frank, installing a hose via the exhaust fan is pretty difficult. It is essential to consult with a specialist to ensure that all safety issues are addressed. A rather long hose would also be required for the installation.

In order for the device to operate properly in air cooling mode, the portable air conditioner venting hardware should be fitted. Though portable air conditioners come in a variety of shapes and capacities, the venting processes are typically the same.

Your portable air conditioner would then become operational. Just switch it on and let the machine bring down the temperature as needed.

When utilizing the venting system, make sure to maintain the exhaust hose upright. Avoid increasing the length of the exhaust hose. It can be abbreviated though. Using an extension cord with a portable air conditioner is also not a good idea.

Is It Possible To Vent A Portable AC Into Another Room?

Yes, it is conceivable, although not advised, to vent a portable air conditioner into another room. Due to significant thermal instability and heat transmission through partitions and openings, rejecting hot air in an adjoining room would limit cooling efficacy.

As you vent a portable air conditioner to another room in the house, the heat that is vented causes the room to become warmer. This is not the case if you are venting the air conditioner outside.

Typically, a portable air conditioner will be chosen for factors such as portability or a lack of window accessibility. Due to tight condominium and communal restrictions about window conditioning, some may utilize it.

What if you don’t get access to a window? Or what if you want heating in the next room? Is there a way to vent it into yet another space?

Yet, if you are venting it into another area within the apartment, make certain that none in the room will be harmed by the heat. If you must vent the portable air conditioner into another room in your house, be sure that the area receiving the heat has a method to disperse it.

Contemplate opening a window or using an exhaust fan to expel the heated air from the area if indeed the room on the receiving side of the exhaust has one.

Many portable air conditioners expel moisture automatically, resulting in excessive humidity in the outlet area, potentially creating conditions for mold and fungi.

Understanding what is at risk and whether it is truly worth it is preferable.

Can You Vent A Portable Air Conditioner Into A Crawl Space?

No, it’s not recommended to vent an air conditioner into a crawl space as the space will heat up. You won’t get as much cooling as you’d like and there will be an increased humidity problem, but it should work to some extent.

If it’s a single-hose AC, the heat will create higher humidity as single-hose ACs are less efficient. As they work with one hose only, the air has to find a way inside the house. So, while the AC unit itself may be half-efficient, the way it operates renders it ineffective.

You might go for a two-hose AC, which is more efficient. But, while the AC is running at a higher efficiency, you’d be recirculating the hot air in the crawl space, reducing its effectiveness and harming anything kept down there.

With a single-hose AC, air is constantly blown into the crawl space, which then exits through the foundation vents, keeping it cool and humid. Two-hose AC will make it hotter and more humid with each pass through the air conditioner until it can no longer function.

Can You Vent A Portable Air Conditioner Through A Door?

Yes, you can vent your portable AC through a door into another room. If the room you’re conditioning has a door leading to another area, this is a good choice for venting.

The first issue to check is that the area on the other side of the door would be acceptable with the elevated temperatures.

This is not an issue if you are venting the air conditioner straight to the outside. However, venting a portable air conditioner to another room in your house might cause issues.

You’ll also want to keep air transfer across conditioned and non-conditioned regions to a minimum.

Using a standardized door seal helps keep unnecessary heat from entering the conditioned space. Once you vent a portable air conditioner through the door, the seal fills the large gap created by an open door.

Hot air has to go someplace because of how a portable air conditioner is constructed. Preferably, this will be outside, but it would rely on where the unit is situated. Door venting is not an alternative in a living room in the middle of the house or a workspace in the rear of the building. You might be lucky if the unit is near an entry or exit door.

Using a door is the simplest way to vent a portable air conditioner. There are components designed particularly for doors that enable the exhaust to be vented outside the building. They are really simple to use and will work with any machine.

You can also place the air conditioner near the balcony or patio door to make it easier to vent outside.

Another option is available to pet owners. If you have a little pet door in the house that allows your pets to enter and go whenever they wish, you can use that to your advantage. Yes, it might make your furry friends a little unhappy with the scenario, but it will give momentary ventilation while the system is running. Just ensure you can achieve a secure fit around the exhaust hose’s entry.

Frequently Asked Questions

Can I use a portable air conditioner without a window?

Yes. Although most portable air conditioners need a window to expel hot air, there are alternative solutions to explore if your room lacks a window. Based on your preference, you can vent the heated exhaust air through walls, the roof, doors, or dryer vents.


A portable air conditioner is ideal for thousands of households that want effective spot cooling, whether momentary or permanent. Even if there is no window, you wouldn’t have to count out such portable systems because there are several ways to vent them.

We’ll presume you now understand how to vent a portable air conditioner without a window.

Please remember that it is important to put the portable air conditioner in an appropriate location and to guarantee that the line is properly attached when vented. After you’ve finished inserting the hose through any opening or duct you made for it, you may apply a sealant to hold it in place.

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