man relaxing in air conditioning

How Does an Air Conditioner Work?

The temperatures are reaching record numbers across the U.S. and most homes are utilizing some variety of air conditioner to beat the seasonal heat. Although we are all appreciative that your air conditioner is functioning, the team at B & G HVAC in Marshalltown would like to teach you how it works.

The Basics

There’s plenty of science behind keeping your living space cool. Your air conditioner runs in a comparable way to your refrigerator, of course your AC has a more difficult job to manage. Both your fridge and AC cool with a reoccurring loop of refrigerant, in your air conditioner this refrigerant loops from inside to outside your home. This refrigerant quickly alters from a liquid to gas and back to a liquid again. It enters your home as a sub-cooled liquid and as it evaporates it takes in heat from your indoor air and expands back into vapor. This vapor then moves back to your outdoor unit where the heat is let go and is then condensed back into a sub-cooled liquid.

Four Components

There are 4 central sections to your air conditioner unit: a compressor, an evaporator coil, the condensing coil and an expansion valve.

The evaporator coil is where your refrigerant evaporates from a sub-cooled liquid into a super-heated vapor. This component can be located inside your home, in your garage or sometimes in your attic. Warm air transports throughout the cold evaporator coil and the heat is removed from the air. This cooled air is then transferred throughout your home.

Your compressor is located in your outdoor condensing unit. The super-heated vapor from your evaporator coil goes into the compressor which surges the pressure of the vapor until it is converted into hot, high pressure vapor. The hot vapor then goes back into the condenser coil where less hot outdoor air flows across the coil, heat is released outdoors and the refrigerant is converted back into a sub-cooled liquid. This sub-cooled liquid is then returned to the indoor evaporator coil and through an expansion valve or metering device. The process is then repeated.

That concludes your physics lesson of the day…your air conditioner runs on an endless loop of science. We realize that it’s not as important to you how it works, but that it’s working. If you’d like to talk about staying cool and comfortable in Marshalltown give us a call at 641-752-3429 or set up an appointment using our online scheduler. With the help of our team and science we’re going to make it through this sweltering summer.