HVAC Condenser Replacement Options

I’ve owned my 23 year old house for less than 1 year.  It has 2 HVAC zones (upstairs/downstairs) forced air heating/cooling with propane heating.  The winter heating was very expensive… I’ve owned my 23 year old house for less than 1 year.  It has 2 HVAC zones (upstairs/downstairs) forced air heating/cooling with propane heating.  The winter heating was very expensive…Read MoreGreenBuildingAdvisor