Troy Mauder installed a Geo-thermal Carrier system in our new construction in 2007. We are now going through our second heating season and we are pleased that the efficiency on this unit not to mention Troy's workmanship is outstanding. We are heating a 2500sqft home for a lot less than our old 1700 sqft brick ranch home using boiler heat with propane. The summer central air using the Carrier system hardly changes our electric bill.Thanks Mauder Heating and Air,Rod