Her house is build with the standard 1953 sandwich of 3/4 to 1/2 Cider clapboard -- a 2X4 -- and the 1/2 inch Gypsum board. Essentially, no insulation or sheeting. The ceiling have a 1/2 inch brown felt: A material I never saw before. Nothing else.
Well, Seattle, WA "suburb" have a lot of pretty big house.
This year, she will use an electric boiler (electric rate in Seattle is decent). That should help a lot to reduce the short cycling of the oil burning furnace. As of November, she already save several hundred.
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