ENERGY STAR ROOFING CALCULATOR

 In Steps 1 - 5, you will be asked to specify details about your building, heating and cooling systems, existing and proposed roof, and location. Some of the questions have both numeric and text options. The text options should be used when you don't know the required value, and will supply a default, listed in parentheses. If you know the correct numeric value please select it from the list.

Step 1. Building Details    Year of construction    Before 1980 1980 or later    Building type   Residence Office Retail  Days of operation per week   4 4.5 5 5.5 6 6.5 7   day(s)

Step 2. Heating and Cooling Systems    Type of heating system   Gas Furnace Electric Heat Pump  Gas furnace efficiency   Low (pre-1980) 70% Moderate (post 1980) 78% High (Energy Star) 90% 65% 75% 80% 85% 95%  A/C SEER    Low (pre-1982) Moderate (1982-1992) High (10) Energy Star (12)

Step 3. Roof Details    Roof insulation R-Value   Low (3) Medium (11) High (38) 0 1 3 5 7 11 19 30 38 49  Existing dark roof solar reflectance   Asphalt shingle (.15) Bitumen, Black (.05) Bitumen, White Granular (.25) Built-up w/Dark Gravel (.10) Built-up w/Light Gravel (.35) Membrane, Black (.05) Membrane, Gray (.25) Membrane, Beige (.45) Red concrete tile (.2) 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55  ENERGY STAR® labeled roof products solar reflectance   Asphalt shingle w/White coating (.7) Bitumen w/White coating (.7) Built-up w/White coating (.7) Membrane, Blue (.6) Membrane, White (.75) Red concrete tile (.7) 0.25 0.3 0.35 0.4 0.45 0.5 0.55 0.6 0.65 0.7 0.75 0.8 0.85 0.9 0.95  Conditioned flat roof area (sq. ft.)   (Min: 3,000 Max: 1,000,000)

Step 4. Energy Prices    Cost of electricity (cents/kWh)   (Min: 2.0 Max: 20.0)  Cost of natural gas (cents/therm)   (Min: 30 Max: 200)

Step 5. Location  Zip Code      - OR -    City and      State   -- AK AL AR AZ CA CO CT DC DE FL GA GU HI IA ID IL IN KS KY LA MA MD ME MI MN MO MS MT NC ND NE NH NJ NM NV NY OH OK OR PA PR RI SC SD TN TX UT VA VI VT WA WI WV WY