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Heat Pump system design in 110 year-old home
We have a 1908 3-bedroom, 1 1/2 bath, 1800sf. gambrel-roof home with insulated walls and attic. Our oil burner (forced hot air) just conked out and we want to switch to a heat pump system (Electricity is sourced from clean energy RECs, so no more fossil fuel!!). We don't raise the heat beyond 68 in winter and are used to no air-conditioning in the summer, so prefer not to oversize the system, especially to keep the budget down on a new system.
Our existing ductwork runs to floor registers that are located farthest from the exterior wall in each room! Should we then reuse existing ductwork, (with aerosealing), or install new ductwork to better located SA registers? How much more efficient and comfortable will the house be with registers at the window wall?
We've received quotes showing: 2 ton units per floor, (1)3 ton and (1)4 ton unit to cover the 2 floors, all ducted. Some quotes have a basement unit using existing ducts and an attic unit with new ducts dropping into each bedroom via a ceiling register. One quote has a single heat pump option in the basement using all existing ductwork to both floors.
The possibilities are many!! What would be the wisest way to heat/cool this home? Advice is greatly appreciated : )