Most of us know that refrigerant is the substance that is key to the cooling process, but few of us have ever seen it. It flows mysteriously through our HVAC systems, absorbing heat from our homes’ interiors as a cool, low pressure liquid, and then is pumped outdoors as a hot, high pressure gas, where the heat is exhausted by a fan, then does it all over again. That’s more than most homeowners know about refrigerant. But because laws governing […]