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Green Home

Browse 11 green home tools. Opening Solar Water Heater Efficiency Calculator.

  • Building Heat Loss & Insulation CalculatorEstimate heat loss watts from envelope area, ΔT, and R-value.Use this to find where your home leaks heat and size heating correctly.
  • Home Insulation Savings CalculatorEstimate annual heating and cooling savings from upgrading wall insulation and windows—before/after energy use and efficiency score.Use this to see if an insulation upgrade pays for itself in lower bills.
  • LED Savings & ROI CalculatorCompare legacy bulb vs. LED costs, CO₂ savings, and payback time for a single fixture.Use this to see how fast swapping one bulb to LED pays back.
  • LED vs. Incandescent ROI CalculatorEnergy and bulb replacement savings when matching lumens with lower watts.Use this to see the full savings of switching your lighting to LED.
  • Smart Thermostat Savings CalculatorHVAC kWh reduction from setback schedules and seasonal rates.Use this to check if a smart thermostat would really lower your bill.
  • Window Solar Heat Gain (SHGC) CalculatorCooling load from glazing SHGC, area, and sun exposure.Use this to see how much your windows heat the house and add to cooling costs.
  • Microgrid ROI CalculatorBreak-even timeline and 10–20 year returns for solar, storage, and on-site generation microgrids.Use this to see when a solar-plus-storage microgrid starts paying for itself.
  • BESS Round-trip Carbon Cost CalculatorEstimate annual kg CO₂ from battery round-trip conversion losses and compare grid charging vs. renewable charging.Use this to check your battery setup is helping the climate, not hurting it.
  • Solar Water Heater Efficiency CalculatorEstimate thermal efficiency, absorbed kWh, and electric heating savings from tank volume, ΔT, sun hours, and collector area.Use this to see how much a solar water heater cuts your electric heating bill.
  • Small Wind Turbine Yield CalculatorEstimate rotor power (W), daily kWh, and annual energy from blade diameter, average wind speed, and system efficiency.Use this to check if your site has enough wind to make a turbine worthwhile.
  • Standby Power AggregatorAdd TVs, chargers, consoles, and adapters to see total vampire power cost and what you could buy instead.Use this to total up your standby waste and see what that money could buy instead.

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