Observed arrival · 2026-10-09
The 61-Calculator HVAC Desk
A free set of HVAC calculators for sizing equipment and ducts, estimating costs, and planning home comfort.
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- Homeowners, DIYers, and HVAC contractors
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- The sample cooling-cost estimate is $97.92 for a month at three tons, SEER2 15, and eight hours of daily use.
Field notes
The example scenario pairs a three-ton air conditioner with a 60,000 BTU/hr furnace input at 95% AFUE, plus a 6,000 BTU/hr window unit for a 12-by-15-foot bedroom. Its cooling-cost estimate uses electricity at 17 cents per kWh and notes average insulation, eight-foot ceilings, three people, and a kitchen. The site says its loads, ratings, and cost figures were last checked on October 7, 2026.
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