How Does an Air Conditioner Work?07/18/2016Summer has arrived 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 get out of the heat. As you are relaxing in your comfortably cool home or office, thankful that your air conditioner functions, let’s gain some insight at how an average central heating and cooling system works. The Basics Your air conditioner operates the same way as your refrigerator, but obviously instead of keeping a little space cool, it has to cool your entire home. Both use a refrigerant that converts simply from liquid to gas, back to liquid again. In your air conditioner, the refrigerant is on a consistent loop from the outdoors to the inside of your home. It goes into the home as a sub-cooled liquid that evaporates and collects 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 transferred back to a sub-cooled liquid. The Components Your AC system is created out of four main pieces: an evaporator coil, a compressor, a condensing coil, and an expansion valve or metering device. The piece where your refrigerant evaporates from a sub-cooled liquid to a super-heated vapor is called the evaporator coil, which may be inside your home, in your attic, or in your garage. As warm indoor air is blown over the cold evaporator coil, heat is removed from the air…and the cooled air is blown among your home. From the evaporator coil, the now super-heated vapor refrigerant goes back to the compressor located in your exterior condensing unit. The compressor increases the pressure of the vapor until it changes into a hot, high pressure vapor. The now super-hot vapor meets the condenser coil where less hot air blows across the coil, removing heat to the outdoors, and changes 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 a consistent loop of physics at work. We know the important thing to you isn’t really how it works, but that it’s functioning successfully. If you’d like to talk science or just about staying cool, giving our professionals a call at 503-848-3838 or set up an appointment with us online. We will work with you and the laws of physics to keep you cool this season.