Home Energy Calculators & Guides

Square footage to BTU cooling/heating estimates, duct loss factors, weatherstripping linear footage, and attic R-value payback timelines.

Calculators

Home Energy Savings Calculator — Calculate annual utility bill savings, kWh/therm reductions, and ROI across air sealing, attic insulation, and heat pumps.
Heat Pump Sizing Calculator — Calculate heating/cooling tonnage (1.5 to 5 tons) and BTU capacity (18,000 to 60,000 BTU) based on square footage and climate zone.
Solar Panel Calculator — Calculate solar system size in kW (e.g. 8 kW), panel count (400W monocrystalline), roof area, and 30% federal tax credit.
Electric Vehicle Charger Calculator — Calculate Level 2 EV charging speed (miles added/hr), circuit breaker amps (40A to 60A), wire gauge (6 AWG / 4 AWG), and cost.
Water Heater Energy Calculator — Compare annual operating costs between Standard Electric, Gas Tankless, and Hybrid Heat Pump water heaters.
Window Energy Loss Calculator — Calculate BTU heat loss, U-factor improvements (0.30 vs 1.10), and annual HVAC cost savings replacing drafty single-pane windows.
Attic Insulation Payback Calculator — Calculate simple payback period (in years) and return on investment (ROI) upgrading attic insulation from R-13 to R-49/R-60.
Smart Thermostat Savings Calculator — Calculate annual dollar savings (8% to 12% HVAC reduction) and months to break even installing a smart WiFi thermostat (e.g. Nest / Ecobee).