Hi All,
We have a high efficiency HTC mod con natural gas boiler w/ radiant downstairs and flat panel radiators upstairs. It does amazing in our 2200 ft2 Vermont house and our gas bills are no more than $130 in the coldest months, but we have solar now, and want to start to move away from fossil fuels, AND our second floor gets to the high 80s in summer with no AC. So we’re looking to add heat pumps. I want to start with the upstairs only – and I’ve read every article here that I can find. So it sounds like a most efficient option would be a one to one singular ductless mini split in one bed that we’ll hope will spread air around the top floor through open doors (3 beds and ~900ft). I was also wondering about ducted, but can’t find clear guidance. We have an attic that is not “conditioned” per se, but the insulation is R50 closed cell spray foam on roof underside. Could we do a ducted heat pump system with ducts to each bedroom in that attic successfully? It seems like it would be way more comfortable. There is no insulation on the attic floor – just on that roof underside. Any advice would be much appreciated, thanks!