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this concerns a one-story, two-bedroom addition to a rambling unheated summer home in the marine environment of cape cod, massachusetts. this addition was built in the late 50's and has little ceiling insulation, no floor insulation, and presumably only ok wall insulation, if that. the old GFA unit has finally died so now i would like to have a new one installed. the space isn't large, about 1175 square feet including the mechanical/storage closet. the windows, while not numerous, are single glazed, and there is a fairly sizable picture window in the living room. the old GFA unit has a conventional flue.
this space will not be used in the winter, probably ever, but is used in the spring and fall, and heating is necessary from time to time. my contractor spec'd a 90,000 btu goodman 80% efficient unit. my crude calculations tell me i need a 54,000 btu unit and when i told him that he said he could do a 70,000. my biggest priority is that the unit be quiet and not wasteful. does anyone have any suggestions? the space is shown in the picture - it is the section with the bay window closest to the camera.
thank you all in advance,