Home Energy Savings Calculator
Compare three household energy scenarios using your utility rates and measured equipment use.
Illustrative defaults. Enter actual bulb wattages and measured standby use. The HVAC percentage is your scenario, not a DOE prediction. Negative lighting results mean the new bulbs use more energy. Upgrade costs and interactions between lighting and heating are excluded.
Frequently asked questions
How is lighting savings calculated?
The calculator multiplies the wattage difference by the number of bulbs, daily operating hours and 365 days, then applies your electricity rate. A 60W-to-9W change for three hours daily saves 55.845 kWh per bulb annually.
How much can a thermostat adjustment save?
DOE says an appropriate 7–10°F adjustment for eight hours daily can save up to 10% on annual heating and cooling. This is not a guaranteed percentage per degree. Enter a scenario appropriate to your home; some heat-pump systems need different thermostat controls.
How should I estimate standby savings?
Measure the power you can actually eliminate with a plug-in meter or equipment data. Watts multiplied by hours and divided by 1,000 gives kWh. Keep essential equipment powered as required.
Can I add these estimates?
The arithmetic adds the entered scenarios. Avoid counting the same load twice, and remember that lighting heat and HVAC needs interact. Upgrade purchase costs are not deducted.
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