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What You Need To Know About Venting A Portable AC Into The Cold Air Return

What You Need To Know About Venting A Portable AC Into The Cold Air Return

Ventilating your portable AC is the most important thing you must perform to ensure proper operation. You should consider venting it through a window as one of your finest solutions. However, what if there are no windows nearby? Is it possible to vent it into a cold air return? . Yes, you can use the cold air return to vent a portable air conditioner. But it’s not a smart move. This is because the central cooling system in your home is working harder than it should.

To learn why it is unwise to vent your unit through a cold air return vent, keep reading.

We’ll also provide you with additional methods for venting your portable air conditioner without using a window. We’ll also go over some methods to enhance the efficiency of your portable AC as well as why you might want to vent it to another room.

Why Does A Portable AC Need Venting?

Air conditioners remove heat from the air and disperse it to another location. When an air conditioner cools your space, the heat from inside is transferred outside.

If your portable air conditioner is not vented to another area, heat will return to your room. Your air conditioner won’t be able to cool the space as a result. Even the temperature in your room may rise from before.

In addition to removing heat from your area, venting your air conditioner also removes moisture. Air conditioners dry out the air as they cool it. This humidity is partly vented outside of your room.

Why Should Portable ACs Not Be Vented Through Cold Air Return Vents?

The heat that your portable air conditioner exhausts through the return vent is taken in by your home’s central air conditioning system. Your home’s central air conditioning system must function in order to remove this heat.

Essentially, the device will force the air conditioner in your home to work twice as hard to remove heat from the area you are cooling.

But this approach might work if there aren’t any other ways to exhaust directly outside.

If the central air conditioner in your home is capable of removing excess heat, there shouldn’t be any issues.

How Do I Vent A Portable AC Through A Window?

What You Need To Know About Venting A Portable AC Into The Cold Air Return

Most portable air conditioners are simple to install and vent thanks to the window kit that the manufacturer provides. In a short time, you can reach a cozier interior area.

A standard window kit includes the vent hose adapters, one or two vent hoses, and a window bracket. You should place your vent pipe close to a window because it is typically 4 to 5 feet long.

The steps below must be followed in order to vent your portable AC through a window:

  • Before installing the hose, secure any adapters or connectors.
  • The window kit should be adjusted to fit the entire length of your window. If necessary, trim the window bracket to ensure a snug fit for your window. Your specific model may come with screws to hold the window kit in place. The kit can then be secured in place by shutting your window.
  • The window kit and vent pipe should then be connected. You can start cooling right away after your model is fitted and has been properly vented. Connect it, then choose your options.

Can A Portable AC Be Vented Through A Casement Window?

You can, indeed! Many people think they can’t utilize a portable air conditioner because their windows are casement or crank out windows. You can go through this easy, so don’t worry. Your window can still be opened by simply cutting a piece of plexiglass to fit your window and mounting it like a screen.

Create a 5 inch hole near the bottom of the piece of plexiglass. Following a quick insertion of the vent pipe into the hole, you are good to go. Additionally, employing plexiglass protects the window’s view.

How Can Portable ACs Be Vented Without Windows?

If the room you want to cool doesn’t have a window, you can use the following areas of your house to vent your portable air conditioner.


What You Need To Know About Venting A Portable AC Into The Cold Air Return

Through a sliding door or a window is the simplest way to vent a portable air conditioner. The good news is that there are solutions available to help you expel warm air that are specifically made for sliding doors. They are easy to place on your doors, which enables your AC to work.

But the majority of portable AC hose pipes are usually not particularly long. As a result, the unit must be located close to the door.

If the hose line is placed too far from the door, it could not be able to exhaust the warm air outside.

Fortunately, some portable air conditioners include hose lines that are a little bit longer.

Drop Ceiling

To fit the hose to vent the AC, you must drill a hole through the ceiling panel. Make careful to keep your hands away from the pipes and cables that are above the ceiling panel in your room.

After inserting the hose through the hole you have created, apply a silicone sealant to fill in the spaces that are still open.

You must monitor the temperature and humidity in the ceiling space to make sure that they are not excessively high.


What You Need To Know About Venting A Portable AC Into The Cold Air Return

A portable air conditioner can also be vented by drilling a hole in your wall. Notably, the majority of homeowners decide to drill a hole in their walls after trying many other ways without success. It provides a long-term solution for your device.

It may be difficult to correct any errors you make if you don’t have the right tools to cut a hole in your walls. The size of the hole that needs to be bored depends on the diameter of the hose tubing for the AC. Consider how frequently you’ll use the venting opening for your portable air conditioner as well.

After the hole in your wall has been drilled, completely seal it to keep out dirt, vermin, and other irritants from the outside world. The best technique for mending the hole is to use silicone caulk. Simply make a 45-degree cut at the hose’s tip, insert it into a caulk gun, and use caulk to seal the space around it on the wall.

You need to consider where you want to drill into the wall. Your first option should be an exterior wall with an outdoor air vent. Whether you are drilling through stone, brick, drywall, or wood, finding the safest drilling spot is crucial. If you drill the studs or beams that support the building, for example, you run the danger of weakening it.

Can A Portable Air Conditioner Be Vented Into Another Room?

Ventilating a portable air conditioner into a different room is possible but not advised. The effective cooling of a neighboring room would be hampered by the rejection of hot air due to a considerable thermal imbalance and heat conduction through walls and gaps.

Most units release moisture automatically, which raises the humidity in the outlet area and may promote the development of mold and mildew.

Different room configurations may exist in a person’s home. On occasion, using the vent’s heat could be a wise choice. But it’s better to know what’s at stake and whether it’s worth it.

Tips To Increase Your Portable AC’s Efficiency

With these three suggestions, you can make the most of your portable air conditioner and enjoy a fruitful, lasting relationship with it.

  1. Close any doors and windows leading into the room you’re trying to cool. Additionally, try to remove as many heat sources from the area as you can, such as the lights and electronics.
  2. The finest piece of advise anyone can give you is to turn on your device earlier than necessary. If it is the only cooling source in the area, it is preferable to turn it on when the room is still reasonably cool.
  3. Although most portable AC units come with a pre-filter, it is frequently desirable to use a different filter. Make careful to replace the filters approximately every three months.


It is best to seek advice from your reliable HVAC specialist when determining whether to vent your portable AC to the cold air return.

What You Need To Know About Venting A Portable AC Into The Cold Air Return

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