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Sizing Calculator

The following technique can provide you with an approximate size estimate for your new furnace or central air conditioner. Although you may reasonably use this estimate as a first pass when browsing through furnace or air conditioner models, you (or your HVAC contractor) should complete a thorough load calculation before you make your purchase.

1. Square footage of your home: square feet (ex: 2400)
2. Which of the following statements best describes your home and its insulation?
No insulation in walls, ceilings, or floors; no storm windows; windows and doors fit loosely
R-11 insulation in walls and ceilings; no insulation in floors over crawl spaces; no storm windows; doors and windows fit fairly tight
R-19 insulation in walls, R-30 in ceilings, and R-11 in floors; tight-fitting storm windows or double pane windows
"Superinsulated" house with R-24 wall insulation, R-40 in ceilings, and R-19 in floor; tight-fitting storm windows or double pane windows; vapor barrier sealed carefully during construction
Earth-sheltered house with little exposure; well insulated

 
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