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ECONOMICS OF RETROFITTING
CALCULATION OF ENERGY SAVINGS
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annual heat loss ASHRAE attic insulation Back Additional Inches batts building envelope Bureau of Standards calculations cellulose combination of ECT's Compute annual heat considered cooling hours cooling load crawlspace degree days discount rate dollar savings energy conservation investments energy conservation techniques energy prices estimates floor insulation glass fiber global optimum heat gain heat loss gain heating and cooling heating loads homeowner HVAC inches of insulation increment of insulation installation joists last increment level of insulation level of investment lifetime marginal analysis marginal costs marginal savings MS/MC ratio National Bureau o o o o o o optimal combination optimal level Pay Back Additional payback period potential rate of return residential retrofitting sol air square foot storm doors storm windows temperature equivalent thermal conductance Thermal Insulation thermal resistance unheated areas wall insulation weather stripping windows and doors