Can you put an air conditioner in a room without a window?

Author: Dr. Brenda Weber  |  Last update: Sunday, August 17, 2025

The Bottom Line. You can enjoy the cool air in your room, even if there is no window. You just need to find a suitable type of AC that works in windowless spaces like ductless mini-split ACs, evaporative coolers, and through-the-wall ACs.

What happens if you use an air conditioner without a window?

Without a window, there's no way to properly exhaust the hot air produced by the air conditioner, which can lead to inefficient cooling, increased energy consumption, and potential damage to the unit.

Can you put an air conditioner in a room with no window?

Vent through a door: If there are no windows available for venting, you may be able to vent the air conditioner through a door. Simply cut a small hole in the door and install a vent cover. Vent into another room: If there's another room nearby with a window, you may be able to vent the air conditioner into that room.

Is it safe to use AC in a closed room?

For prolonged use, consider occasional ventilation to refresh indoor air. In summary, while it is safe to run an air conditioner in a closed room, it is advisable to monitor air quality and humidity levels and ensure proper maintenance of the unit.

Do windowless air conditioners really work?

They do work, not the best, and even a window unit is better but they do work. Get one with 2 hoses if possible, otherwise it is pulling in cold house air and exhausting it, vs using outside air.

Can you use a portable AC unit without a window?

How to install AC with no window?

Step 1: Create an opening in the ceiling that aligns with the exhaust port of your air conditioner. Step 2: Connect the venting hose to the exhaust port. Step 3: Place the other end of the hose into the opening in the drop ceiling. Step 4: Use adhesive foam to seal any gaps around the hose to prevent air leakage.

Is portable AC worth it?

Overall, the answer to whether or not portable air conditioners work is yes. If you have a small apartment or home office and you want to cool it down during the summer months, then these units are an excellent choice. They're portable and easy to install so you can move them around as needed.

Is it OK to sleep in air conditioned room?

According to experts, sleeping with the air conditioning on is bad for you, not because it is harmful but because you can't control the device while you're asleep. When the air conditioning remains on at night, the temperature of the room could fall substantially below the recommended threshold.

How do we get oxygen in a closed AC room?

In a closed room, an air conditioner will recirculate the oxygen and nitrogen already present. However, there are always openings and crevices in a room that allow oxygen to be replaced and air to circulate through doors or windows.

Which type of cooler is best for a closed room?

This list has a range of best air cooler for closed room.
  • Honeywell CS071AE Quiet, Low Energy, Compact Portable Evaporative Cooler.
  • Costway Air Cooler and Heater.
  • Costway Evaporative Cooler.
  • Evapolar evaCHILL Personal Evaporative Air Cooler.
  • Symphony DiET 12T.
  • Voltas Alfa 28.
  • Bajaj Frio.
  • Bajaj PX 97 Torque.

Can an air conditioner work when it's not placed in a window?

You can use an air conditioner without a window if you have another way to vent out the hot air. There are different types of ACs that can work in windowless rooms, such as central air, evaporative coolers, through-the-wall, and ductless mini-split air conditioners.

Will a bowl of ice cool a room?

While it might sound strange, you can cool down a room fast with this easy hack. Simply fill a metal or glass bowl full of ice, place it in front of your fan, turn it on, and enjoy the cooling effects.

How to keep a windowless room cool?

Ways to Cool a Windowless Room
  1. Use LED lights instead of incandescent ones. Compared to LED lights, incandescent bulbs produce more heat. ...
  2. Turn off unused appliances and lights. ...
  3. Use the two-fan method. ...
  4. Invest in a ductless air conditioner.

Can you put an AC unit in a room without a window?

Portable air conditioners are an excellent cooling solution for rooms without windows or an exterior wall to install an AC unit. Although most are designed with a hose that takes the warm air outside through a window, you can adapt the hose, so it sends the heat elsewhere.

How long does it take a portable air conditioner to cool a room?

In our portable air conditioner tests, we measure how long it takes the appliance to lower the temperature in a test chamber from 90° F to 85° F. We found that it takes at least 20 minutes—and often much longer. By comparison, the best window air conditioners can cool a room by 10° F in about 15 minutes or less.

Can I use a window air conditioner not in a window?

Can I Use a Window Air Conditioner for Wall Installations? Most window AC units can be installed on or through a wall, but remember that wall air conditioners cannot be installed in windows. Some models come with a kit that includes brackets and instructions for installation.

How do you get airflow in a closed room?

Even without an open window, fans can improve air flow. Point fans away from people. Pointing fans toward people can blow contaminated air directly at them. Use ceiling fans to help improve air flow in the home whether or not windows are open.

Is it okay to sleep in a closed room?

Sleeping with your bedroom door closed can help maintain your desired temperature, which is crucial for a restful night's sleep. In the summer, sleeping with your bedroom door closed can help keep the air conditioning in, while in the winter, it can help keep your bedroom warm and toasty.

How long can you stay in a room without ventilation?

So changes would be even smaller in most homes. Simply put, humans don't take in as much oxygen as we think we do. Based on oxygen alone, estimates are that the average person could survive in a completely sealed, airtight room for 12 full days! Running out of oxygen in a room is quite unlikely.

Why should we not sleep in AC?

While the AC can provide relief, sleeping with it on for long hours can be bad for your health. Dry eyes: AC removes moisture from the air, leading to dryness, itching, and discomfort in the eyes. Lethargy: Cool temperatures can lower metabolic rates and slow down body processes, leading to fatigue and drowsiness.

What happens if you stay in air-conditioned room for too long?

Dry eyes, lethargy, dehydration, dry or itchy skin, headaches, respiratory issues, allergies and asthma, noise pollution, infectious diseases, and indoor pollutants are among the common health concerns associated with prolonged exposure to air conditioning.

Is air conditioning expensive to run?

While aircon can be expensive to run, your overall monthly cost can be reduced with the right model and wattage. Not only should you consider the space you want to cool and heat, but what your energy budget is.

Will a portable AC run up electric bill?

The energy consumption is massive, and you can expect bills to skyrocket. They're weak: A good portion of the energy consumed goes into the exhaust system of a portable unit, which reduces its ability to cool.

Which is better portable or window air conditioner?

There is no separate vent to worry about, and more noise is directed outside compared to a portable air conditioner. In addition, window air conditioners are often more efficient than portable air conditioners allowing them to cool a larger space at a lower cost.

How to cool down a room?

Stave off the sweltering with our top tips to cool down your rooms – fast.
  1. 1: Close curtains and windows. ...
  2. 2: Improvise some air conditioning. ...
  3. 3: Keep your doors closed. ...
  4. 4: Fix reflective window film. ...
  5. 5: Use extractor fans cleverly. ...
  6. 6: Add some bamboo bedding. ...
  7. 7: Cool down your sofa. ...
  8. 8: Eat your meals outside.

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