At Putnam Mechanical, we provide professional geothermal HVAC in Statesville, NC and the surrounding area. Geothermal heating and cooling systems are growing in popularity with homeowners because they offer so many advantages. The design of this unique system uses the warm underground temperature to heat the rooms of a home. The system cools a home in the summertime by absorbing the heat indoors and sending it underground. There are a few important factors to consider before having a geothermal heating and cooling system put in.