How Does an Air Conditioner Work?07/18/2016Summer is in full swing with record highs across the country, and with the vast majority of homes having some type of air conditioner, it’s the best way to escape the sun. As you are relaxing in your comfortably cool home or office, thankful that your air conditioner works, let’s look at how an average central heating and cooling system works. The Basics Your air conditioner operates the same way as your refrigerator, but obviously compared to keeping a little space cool, it has to cool your entire home. Both use a refrigerant that converts swiftly from liquid to gas, back to liquid again. In your air conditioner, the refrigerant is on a regular loop from the outdoors to the inside of your home. It goes into the home as a sub-cooled liquid that evaporates and gathers or soaks up heat from your indoor air, expands back into vapor, then back to the outside condensing unit where it dissipates the heat and is changed back to a sub-cooled liquid. The Components Your AC system is built of four main pieces: an evaporator coil, a compressor, a condensing coil, and an expansion valve or metering device. The component where your refrigerant evaporates from a sub-cooled liquid to a super-heated vapor is called the evaporator coil, which may be inside, in your attic, or in your garage. As warm indoor air is blown across the cold evaporator coil, heat is removed from the air…and the cooled air is blown throughout your home. From the evaporator coil, the now super-heated vapor refrigerant goes back to the compressor based in your outside condensing unit. The compressor increases the pressure of the vapor until it shifts into a hot, high pressure vapor. The now super-hot vapor goes into the condenser coil where less hot air blows across the coil, removing heat to the outdoors, and returns the refrigerant to a sub-cooled liquid. The sub-cooled liquid refrigerant is returned to the indoor evaporator coil where, through an expansion valve or metering device, the process is replicated. Your air conditioner is an endless loop of physics at work. We know the important thing to you isn’t really how it works, but that it’s working correctly. If you’d like to talk science or just about remaining cool, giving our professionals a call at 630-833-1100 or set up an appointment with us online. We will work with you and the laws of physics to keep you comfortable this time around.