Here’s how the air conditioner work. An AC unit removes the warm air inside the room by “sucking the air” and then returning it with cooler air. Most air conditioners circulate the room from warm then cool it, and then blow the colder air.
The AC unit does not suck the warm air and exchanges it with the colder air from the outside. Thus, air conditioners do not ventilate a room.
How to get fresh air in a room with AC?
The simplest answer is, you can open your windows.
But let’s talk about window screens. Some open windows have mesh screens that get dirty. Others have weather stripping which can get dirty too, especially when humidity levels are high. There are also screenless window AC units that you can open up. If you’re outside, you’ll have more fresh air to breathe. But that’s only if you have a good AC.
An installed AC can work wonders in a room with a leaky window or no air conditioning at all. If you’ve ever used a window unit in your bedroom, the hard-packed dirt and dust can get in under the seal of a window.
In my bedroom, the rooms are 2×8 ft (0.8×2.4m) and my window unit did fine since it was about 6 ft tall (1.8m). You can’t rely on sliding glass doors to be air-tight.
How to ventilate a room with AC?
An AC is not designed to ventilate a room, nor is it designed to replace a window, fan, or heater.
There is a saying: The More You Ventilate, the More You Cool! So, air conditioners often provide very little or no ventilation.
The airflow may be powerful to move the hot air around the room, but without moving the cool air, it will not cool the room to comfortable temperatures.
The air inside the room will remain hot during the peak hours of cooling, and when you need the AC to cool the room, it will not be able to cool the air to a comfortable temperature.
An air conditioner produces only about 4% of its cooling effectiveness outdoors. What happens inside the room while the air conditioner is running is 100% up to the occupant.
Does ventilation affects electricity bills with the air conditioner on
When the AC is turned on, a compressor uses a lot of electricity to chill and heat the room. This is the same as if you were to run your household’s heater or air conditioner.
The difference is that your heater or air conditioner does not cool or heat the outside air. A high energy bill is common when a house is filled with controlled AC units.
The AC running for most of the day may be causing a safety hazard when the compressor is running. It may be too much energy to use for ventilation.
If there is a carbon monoxide leak in the home, the room will become too hot to breathe. When an air conditioner is very hot, it may be an issue that the air conditioner needs to ventilate more.
To ventilate the unit, adjust the thermostat to a lower setting.