When it comes to heating your home, there is some crossover between HVAC appliances. Often you’ll have an air conditioner to cool and a furnace to heat. But heat pumps are becoming more prevalent these days, and those essentially simultaneously heat and cool. They simply change the direction of the heat flow depending on whether you want it warm or cool inside your home. Below is a list of the most common factors which, if ignored, can lead to a drastic HVAC service bill for heating repair and high monthly energy bills.