Abstract
Twelve households are analyzed for details of their gas heating energy consumption before and after insulating to determine energy and dollar savings. These are standard, private insulation jobs done without house doctoring and not including any specific infiltration control measures. Our method uses utility bill data for several years before and after insulating; we discuss three methods of using such data. Average yearly energy savings (change in Normalized Annual Consumption) is 23%, ranging from 6% to 43%. Nine of the 12 households saved money; the payback time is no more than 9 years, even assuming no increase in the real price of natural gas. A simple heat load calculation does not accurately predict energy savings.
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