Rule: ~1% saved per °F of 8-hour setback (max ~20%)
Frequently asked questions
How do I calculate thermostat savings? Enter your numbers above and the result updates instantly. For example: Annual heating + cooling cost: $1,800 · Setback: 7 °F · Setback hours per day: 9 hrs → Annual savings: $142.
Is this Thermostat Savings Calculator free? Yes — completely free with no sign-up or paywall. It runs entirely in your browser and keeps working offline; the numbers you enter never leave your device.
How accurate is it? It uses the standard published formula for thermostat savings. Results are estimates for planning — not financial, tax, medical, engineering, or legal advice.