Well, bids are coming in to add geo to a 1904 home with hot water heat (cast iron radiators 7 year old cast iron gas boiler) and Unico air conditioning system.
They all seem to want to hook into the forced hot air (4-5 ton sys).
Some want to also hook into forced hot water, some say won't get the radiators hot enough to do much. (Prob oversized to some degree due to insulation)
All want to keep the boiler as backup for the cold MN winters.
I guess I need about 10ton system to get most of the season.
Issues: When the dual system can't keep up - boiler will kick in and provide 160-180 degree water to radiators. How will mixing with 110-120 from geo hot water sys help at all? ie will half the system (hot water tie in) be useless for that part of the year?
Am I better off just getting what I can from the forced air side and keeping the good old comfortable hot radiators when the smaller system cant keep up?
Anyone happy with 110-120 degree radiators?
Many thanks. Great forum.