It sounds like a system design issue, i.e. they always intended there to be a “primary” heating system below 25F and it was sized as such. For every customer like you, there are 3 more that want to keep a fossil backup system in place so that’s where the market is. Unfortunately that also means customers need to be very educated themselves to select the “right” opinion. There are also downsides to oversizing heat pumps too, and typically oversizing is very common since manual J is overly conservative and installers are used to oversizing fossil systems. Your best bet is more weatherization to decrease heating load so that your HP can meet that load. Yes capacity drops as temperatures decrease, but good ccASHP can maintain full output closer to 0F. Do you have like a 1 ton mini for a whole home in Maine?
It sounds like a system design issue, i.e. they always intended there to be a “primary” heating system below 25F and it was sized as such. For every customer like you, there are 3 more that want to keep a fossil backup system in place so that’s where the market is. Unfortunately that also means customers need to be very educated themselves to select the “right” opinion. There are also downsides to oversizing heat pumps too, and typically oversizing is very common since manual J is overly conservative and installers are used to oversizing fossil systems. Your best bet is more weatherization to decrease heating load so that your HP can meet that load. Yes capacity drops as temperatures decrease, but good ccASHP can maintain full output closer to 0F. Do you have like a 1 ton mini for a whole home in Maine?