Any suggestions, opinions or remarks. I am in the process of building my personal house and was trying to decide on a heating and cooling system. I live in mid west Ky. I keep the thermostat at about 64 in spring summer and fall and about 75 in the winter. And are certain brands easier maintained. The geo sized for the house will pay for itself in about 10yrs when compared to an 18 seer electrical heat pump according to the calcs form the elect. co-op.