Smart Thermostat Setback Savings Planner

Gauge how much a programmable or smart thermostat can save by lowering the setpoint during unoccupied hours, using a simplified per-degree savings model.

Total yearly spend on heating or cooling.
Total hours each day at the setback temperature.
Difference between occupied and setback temperatures.
Optional. Leave blank for 1.10. Use 1.0 for radiant/steam, 1.2 for heat pumps with smart recovery.

Examples

  • $1,800 annual cost, 8-hour setback of 4°, factor 1.10 ⇒ Result: $198.00 savings
  • $1,250 annual cost, 6-hour setback of 3°, default factor ⇒ Result: $77.44 savings

FAQ

Does this work for cooling as well as heating?

Yes. Enter your combined cooling cost, the cooling setback hours, and temperature difference for warm seasons.

What if I have zoned thermostats?

Run separate calculations per zone and sum the savings, or weight the annual cost by each zone's share of consumption.

How should I handle humidity concerns?

If high setbacks cause condensation or dry-out issues, reduce the setback degrees or hours and rerun the calculation to balance comfort and savings.

Additional Information

  • Savings are estimated in USD per year based on the supplied annual energy spend.
  • The base rule assumes approximately 1% savings per degree for every 3 hours of setback (≈8.25% per degree over 24 hours).
  • Adjust the system factor to reflect equipment responsiveness and insulation quality.
  • Pair this estimate with a utility bill comparison after a pilot period to validate the assumed savings rate.

Related calculators