Home energy & sustainability tools
Free calculators for going green and saving money — solar payback, EV charging cost, insulation ROI, and home-energy savings. Every tool shows real numbers.
23 resources
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Appliance Energy Cost Calculator
Calculate the yearly and monthly electricity cost of running any appliance from its wattage.
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Attic & Wall Insulation ROI Calculator
Calculate how fast added attic or wall insulation pays for itself through lower heating and cooling bills.
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Ceiling Fan vs Air Conditioning Savings Calculator
Estimate the summer electricity savings from using a ceiling fan instead of running air conditioning.
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Federal Solar Tax Credit Calculator
Calculate the dollar value of the 30% federal Residential Clean Energy Credit for your solar project.
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Heat Pump vs Furnace Cost Calculator
Compare the annual heating cost of an electric heat pump against a gas furnace for your home.
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Home Battery Storage ROI Calculator
Estimate the payback of a home battery from time-of-use arbitrage between peak and off-peak electricity rates.
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Home Energy Audit Savings Calculator
Estimate the annual savings and payback from a professional home energy audit and the fixes it finds.
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Home Energy Cost Estimator
Estimate your combined monthly and annual home energy cost from electricity and natural gas usage.
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LED vs Incandescent Bulb Savings Calculator
Calculate the electricity and money you save each year by switching bulbs from incandescent to LED.
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Low-Flow Fixture Water Savings Calculator
Estimate the water and money you save each year by switching to low-flow showerheads and faucets.
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Net Metering Value Calculator
Estimate the annual dollar value of your solar production split between self-consumption and grid export.
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Phantom (Standby) Load Cost Calculator
Estimate what always-on standby power from idle electronics adds to your electricity bill each year.
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Pool Pump Energy Cost Calculator
Calculate what running your swimming pool pump costs in electricity each year.
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Rainwater Harvesting Payback Calculator
Estimate the gallons captured, water-bill savings, and payback of a rainwater harvesting system.
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Smart Thermostat Savings Calculator
Estimate the annual savings and payback of a smart thermostat based on your HVAC spending.
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Solar Loan vs Cash Calculator
See the monthly payment and total interest of financing a solar system versus paying cash upfront.
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Solar Panel Payback Calculator
Find out how many years it takes for rooftop solar to pay for itself after the federal tax credit and rebates.
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Tankless vs Tank Water Heater Calculator
Compare the annual energy cost and payback of a tankless water heater versus a conventional tank.
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Weatherization & Air Sealing Payback Calculator
Estimate how fast air sealing and weatherstripping pay for themselves through lower heating and cooling bills.
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Window Replacement Energy Savings Calculator
Estimate the annual energy savings and payback of replacing old windows with energy-efficient ones.
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Guide
Are Solar Panels Worth It in 2026? The Real Payback Math
A no-hype look at whether home solar pays off in 2026 — real payback periods, the 30% federal tax credit, and the four numbers that decide it for your roof.
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Heat Pump vs Furnace: Which One Saves You More?
Heat pump vs furnace in 2026 — how the two heating systems really compare on operating cost, upfront price, and payback, with a table and the exact numbers that decide it for your home.
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Guide
How to Actually Lower Your Home Energy Bill (Ranked by Payback)
A practical, payback-ranked guide to cutting your home energy bill in 2026 — from free thermostat tweaks to bigger upgrades, with a table showing which moves pay back fastest.
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