How Does a Window Air Conditioner Work?

In most places in the summer months, an air conditioner is needed. If you don’t want to mess with an HVAC unit, then a window air conditioner is a common cooling device. It is a compact unit designed to be installed in a window or a small opening in a wall. Window air conditioners are an affordable and convenient option for cooling individual rooms or small spaces. Wondering, how does a window air conditioner work? It starts by collecting the hot air from a room through a vent. Then, the air passes through the condenser coils and is cooled down.

Let’s take a look further into how a window air conditioner works.

What is a Window Air Conditioner?

A window air conditioner, also known as a window AC, is a self-contained unit that cools the air inside a room. It consists of a compressor, condenser, evaporator, and a fan. These components work together to remove heat from the room. Then, they expel it outside, creating a cool and comfortable indoor environment.

How Does a Window Air Conditioner Work?

Window air conditioners work by collecting hot air from the room through a vent located at the back of the unit. This hot air is then passed through the condenser coils. Then, this is where it is cooled down by refrigerant circulating in the system. Lastly, the cooled air is then blown back into the room by the fan. At the same time, the heat is removed from the air and is expelled outside through another vent.

Window unit needs to be measured to make sure it fits in the room or bedroom.

Factors to Consider When Picking the Right Window Unit

When selecting a window air conditioner for your home, several factors need to be considered. These include the size of the room, the cooling capacity of the unit, and energy efficiency ratings. It is important to choose a unit that can effectively cool the size of the room and has a suitable Energy Efficiency Ratio (EER) to minimize energy consumption.

Measuring for the Right Size Unit for Your Home

To determine the right size window air conditioner for your home, you need to measure the square footage of the room. This can be done by multiplying the length and width of the room. Once you have the square footage, you can refer to a sizing chart provided by manufacturers. This will allow you to find the appropriate cooling capacity required for the room size.

How to Measure for the Right Size Unit for Bedroom

For measuring the right size unit for a bedroom, the process is similar to measuring for the whole home. Measure the square footage of the bedroom and refer to the sizing chart to find the suitable cooling capacity.

Other Recommended Maintenance

Now that you know how a window air conditioner works, let’s look at a few other areas of recommended maintenance. One of those is cleaning a window unit without removing it. You can do this by unplugging the unit, taking off the grill, and taking out the filter.

Another is removing insulation from the attic. To do this, you wear safety gear and use the recommended vacuum to suck out the insulation. You might need to do this if you have mold, rodent infestation, or damage.

Lastly, you may need to clean mold from the window unit. To do this, use chemicals, a scrub brush, and a vacuum.

When to Call a Professional

While installing a window air conditioner is relatively simple, there are instances when it is best to call a professional. If you are unsure about the electrical requirements or if you have any concerns about proper installation, it is wise to seek the assistance of an HVAC technician. An electrician can also be helpful to ensure safe and efficient operation.


Window air conditioners offer a convenient and cost-effective solution for cooling individual rooms or small spaces. By selecting the right unit and properly installing it, you can enjoy a comfortable indoor environment during the hot summer months. Remember to carefully measure the room size. Also, consider energy efficiency ratings, and consult a professional when needed to make the most out of your window air conditioner. While you are adding a window air conditioner, it is a great time to reach out to Advantage Inspections to have a full home inspection here in West Central, Florida.