My 1995 built house has in floor heat with a propane boiler. The price of propane has fluctuated greatly this past year making heating very expensive. Added to that the present boiler is only rated at 82% efficiency. Local heating contractors keep pushing split system heat pumps. I do not want air handlers hanging on my walls. Also, the domestic water heater, original 1995, is on it's last legs.
The house is about 3,000 square feet, two stories with in floor heat on the first floor and electric resistance type heaters on the second floor. This is a moderate climate - Pacific Northwest, Whidbey Island, near Seattle.
I am looking for information on a heat pump solution to be the primary heat source, to heat domestic hot water and possibly replace the upstairs electric resistance heaters with baseboard heat. Would it be possible to size a system for most heating needs - seldom below freezing and keep the propane boiler as supplemental heat for the coldest days and as a backup for when the power fails and we must run on a generator?