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Have a single story 1900 sf home with full basement on a lake in central Maine. The home is being gutted to the studs (2x4). Going to spray foam (closed cell) the whole house, including basement walls and attic. All new windows and Doors. Will have 4 sliders (3 6 footers and 1 12 or 14 foot). My requirements / wishes for a heating/cooling are:
1 system, efficient, propane fuel source, air exchanger, domestic hot water, able to do radiant for about 20% of the floor space (bathrooms and entry), balance should be some type of air system.
One contractor is suggesting a propane boiler with an airhandler. the vents would be located about 12 inches off the floor. The airhandler would do both the heating and cooling. Would have 3 zones for the radiant (master bath, 2nd bath, entry). Super stor for the hotwater requirements. System would not be as efficient but it's one system
Another is suggesting a distributed heat pump in the attic and an oil boiler backup. Run the heat pump 8 or 9 months of the year and the oil boiler the balance. Would have radiant in the tile areas and wall recessed units in the balance of the house. Don't like the idea of 2 systems and concerned the recessed wall units would be noisey over time (internal fan). Domestic would be either on demand or off the boiler.
Is there another reasonable choice?? Do not want hot water baseboard.