Green Home calculators
Insulation, lighting, HVAC, and envelope efficiency
- Green HomeOpen calculator
Building Heat Loss & Insulation Calculator
Estimate heat loss watts from envelope area, ΔT, and R-value.
- Green HomeOpen calculator
Home Insulation Savings Calculator
Estimate annual heating and cooling savings from upgrading wall insulation and windows—before/after energy use and efficiency score.
- Green HomeOpen calculator
LED Savings & ROI Calculator
Compare legacy bulb vs. LED costs, CO₂ savings, and payback time for a single fixture.
- Green HomeOpen calculator
LED vs. Incandescent ROI Calculator
Energy and bulb replacement savings when matching lumens with lower watts.
- Green HomeOpen calculator
Smart Thermostat Savings Calculator
HVAC kWh reduction from setback schedules and seasonal rates.
- Green HomeOpen calculator
Window Solar Heat Gain (SHGC) Calculator
Cooling load from glazing SHGC, area, and sun exposure.
- Green HomeOpen calculator
Microgrid ROI Calculator
Break-even timeline and 10–20 year returns for solar, storage, and on-site generation microgrids.
- Green HomeOpen calculator
BESS Round-trip Carbon Cost Calculator
Estimate annual kg CO₂ from battery round-trip conversion losses and compare grid charging vs. renewable charging.
- Green HomeOpen calculator
Solar Water Heater Efficiency Calculator
Estimate thermal efficiency, absorbed kWh, and electric heating savings from tank volume, ΔT, sun hours, and collector area.
- Green HomeOpen calculator
Small Wind Turbine Yield Calculator
Estimate rotor power (W), daily kWh, and annual energy from blade diameter, average wind speed, and system efficiency.