When it's cold outside a heat pump extracts the heat from the outside air (yes, there's actually heat in the air at cold temperatures) and transfers it inside. When it's warm outside, it reverses directions and acts like an air conditioner, removing heat from your home. One advantage of a heat pump is that it moves heat instead of generating heat, giving you more energy efficiency. During the winter months, the heat pumps ability to heat your home starts to diminish as the outside temperature gets colder. The heat pump has two different types of auxiliary heat, either electric heat banks or fossil fuel (natural gas or LP) that comes on to assist it. When temperatures are in the teens and below, the system is primarily using the auxiliary heat to maintain the thermostat set point. You may notice your heat pumps outdoor units coil forming frost on it when temperatures are below 40 degrees. This is a normal operation of the system. Some of you may remember either yourself or your parents having to put a pot of hot water in the freezer of the refrigerator to defrost it. A heat pump system has a defrost control that will melt the frost off, much like modern refrigerators do. During the defrost cycle, your may hear a pressure change, see steam coming out of the top of the outdoor unit and water running out of the bottom. This is also a normal process of the defrost cycle. Heat pumps are a very economical way to heat and cool your home in the Middle Tennessee area. If you are interested in learning more about a heat pump for your home or business, contact our office at 931-994-284