Powerful Tools for
Smarter Energy Decisions
Free, NREL & DOE-aligned calculators and converters to model solar ROI, LCOE, battery sizing, EV TCO, heat pump balance points, and utility tariffs.
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Engineering Math
NREL & DOE benchmarks
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Heat Pump ROI Calculator
Compare the long-term cost of a heat pump against gas or electric heating.
Air Conditioner Running Cost Calculator
Calculate the real cost of running your air conditioner.
Geothermal Heat Pump ROI
Calculate the long-term financial return of geothermal heating.
Heat Pump Balance Point Calculator
Calculate your dual-fuel thermal and economic switchover temperature where auxiliary gas or electric heat becomes cheaper than a heat pump.
Heat Pump Water Heater ROI
Calculate the ROI of upgrading to a heat pump water heater.
Home Heating Fuel Cost Comparison
Compare cost per Million BTU ($/MMBtu) and seasonal heating bills across Air-Source Heat Pumps, Natural Gas, Propane, Heating Oil, Electric Baseboard, and Wood Pellets.
Home Insulation Savings Calculator
Estimate savings by upgrading your attic insulation.
HVAC Size Calculator
Determine the correct tonnage/BTUs for your home's HVAC.
Pool Solar Heater Savings
Compare the costs of gas vs. solar pool heating.
Smart Thermostat Savings Calculator
Estimate annual HVAC kWh and fuel savings, demand-response rebates, and payback from temperature setbacks and eco-scheduling.
Water Heater Cost Calculator
Compare the running cost of gas, electric, and heat pump water heaters.
Window Upgrade Savings Calculator
Calculate ROI for upgrading to double or triple-pane windows.
Small Calculations,
Big Impact
Every calculation you make brings us closer to a cleaner, more sustainable future.
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