Habitat Project Savings & Heating Cooling Loads
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Energy Modeling Heating and Cooling Loads for Habitat Deep Energy Retrofit Project
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Package*What's In ItBlower Door Target (cfm50)Heating btu/hr/sfCooling btu/hr/sf"Loose" Heat Load"Tight" Heat Load"Loose" Cooling Load"Tight" Cooling LoadNotesAnnual MMBtu Savings$ Savings% SavingsPayback YearsSIRPackage CostCost/ Annual $ Saved
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BaseOld and leaky. R-11 in attic.2500331335,24423,83710,5179,561Pretty awful for a tiny house. 15 btu/hr/sf is good. 30 is horrific.0$00%00$0
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1Typical Weatherization: Dense packed cellulose in walls and loose R-60 cellulose in attic. 70015517,86910,8414,1913,810Just ok for heating load. Thick attic insulation seems to reduce cooling load quite a bit.80.6$38869%33.40.14$12,965$33.41
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22" foam board on walls & roof, 1" spray foam under roof and inside walls. Passive House blower door target.110869,3955,6344,9284,480Only 3-3.5" insulation, but very airtight. Under 10 btu/hr/sf is spectacular.84.7$50672%28.10.51$14,200$28.06
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3Pkg. 2 Plus: Heat pump water heater, ventilating dehumidifier, duct design110869,3955,6344,9284,480Adding more exotic HVAC equipment for fresh air. No change in insulation or heating/cooling loads.90.3$67177%29.10.49$19,500$29.06
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4Package 3 Plus: Red targets for if we miss. Higher blower door, no foam board on roof, just spray foam.40011713,5018,1665,5205,019What if I miss? This is the contingency plan. Still better than cellulose for heating which is what I really care about.88.3$61275%31.90.41$19,500$31.86
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5Package 3 Plus: Triple pane windows110748,9445,3923,4763,160Windows help for cooling, but very little for heating. A high cost to pay for 5% less heating load. We used double pane windows.91$69078%31.90.44$22,000$31.88
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*All packages include closed cell spray foam on rim joists and basement/crawl walls, two-ton two-stage heat pump, and Ecobee thermosat.
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Cleveland is a heating dominated climate, so that's what our focus is on. If you live somewhere south, you would have different priorities.
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"Loose" loads are close to Manual J calculations, but these are done through TREAT energy modeling software. "Tight" is the sum of calculated load for individual spaces.
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Utility cost assumptions: $.55/therm, $.10/kWh.
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Heat/Cool Loads