Considering retrofitting my 1906 house for geothermal. I live in Maryland, near DC so the climate is not extreme - little hot in the summer. The retrofit will include having duct work put in my old walls. The horsehair plaster is pretty bad anyway and covered in most rooms with dry wall. Currently paying about $5000/year for oil heat and hot water so even a $25000 system could pay off in about 5 years. Also there is a lot of federal, state and county tax breaks making this a $15000 retrofit. My current concern is giving up my nice warm radiators for a vent blowing warm air at us - far less effective heating - right?
Looking for experience others have had with leaving radiators for forced air heat and with digging up your yard for geothermal. Any regrets??