Sizing Your Furnace or Air Conditioner

A couple times a year I get a call from a customer who had a new furnace installed by another HVAC contractor in their home. They proceed to tell me that it doesn’t heat their home properly- or it’s not warm enough in one or more of their rooms. I always ask if they had a heat calculation done on their home prior to installation, and almost always they answer, “I don’t know what that is.”

Make sure that when you have a HVAC company give you a free estimate on a new furnace or air conditioner they do a heat gain or heat loss calculation. It’s common practice. It’s unacceptable if they don’t calculate one for you. A heat calculation is used to determine how much heating or cooling your house needs, using BTU’s (British Thermal Units). A few factors play into this calculation- including the size of your home, insulation, how many floors you have, windows, and the duct runs.

The size of your furnace or air conditioner plays a large role in efficiency, directly impacting your monthly energy costs. If a furnace is too small for your home, it will have to work extra hard in order to bring your home to the proper temperature, compromising their efficiency. If a furnace is too large, it will heat your home too quickly, cycling on and off constantly, thus driving your efficiency down as well.

Ask the HVAC Company who is visiting your home to provide you with details regarding a heat calculation. If they haven’t made one, be sure to ask them how they determined the right size system.

You don’t need to worry about the sizing of your equipment too much- Metro Heating and Cooling can perform a heat calculation for you to determine the exact size furnace or air conditioner you need to keep your home at the desired temperature. Call 651-294-7798.