Thermostat Setback Savings Calculator
Heating/cooling energy saved by night or away setbacks (% per degree rule).
Physics behind it: smaller indoor-outdoor ฮT = proportionally less loss for every setback hour. Exception: don't deep-setback heat pumps with resistive backup โ recovery spikes the strips.
Formula
Thermostat Setback Savings Calculator is a free thermostat setback savings for HVAC designers, technicians and energy auditors โ instant, accurate and 100% client-side, with the governing formula and reference shown next to the result so the number can be defended, not just quoted.
About Thermostat Setback Savings Calculator
Heating/cooling energy saved by night or away setbacks (% per degree rule). The calculation implements โ1.8% per ยฐC per 8-hour setback (DOE rule of thumb), capped 25% (US DOE โ thermostat setback guidance). Physics behind it: smaller indoor-outdoor ฮT = proportionally less loss for every setback hour. Exception: don't deep-setback heat pumps with resistive backup โ recovery spikes the strips.
How to use Thermostat Setback Savings Calculator
- 1Enter Annual HVAC energy cost.
- 2Enter Setback amount in ยฐC.
- 3Enter Setback hours/day in h.
- 4Read Estimated saving, Annual saving instantly โ no submit button needed.
Why use Thermostat Setback Savings Calculator?
- โImplements the standard formula โ โ1.8% per ยฐC per 8-hour setback (DOE rule of thumb), capped 25%
- โReference cited on-page: US DOE โ thermostat setback guidance
- โRuns entirely in your browser โ nothing uploaded, free forever
Frequently asked questions
What formula does the Thermostat Setback Savings Calculator use?+
It computes โ1.8% per ยฐC per 8-hour setback (DOE rule of thumb), capped 25%, per US DOE โ thermostat setback guidance. The formula is displayed under the result.
What should I keep in mind when using this calculator?+
Physics behind it: smaller indoor-outdoor ฮT = proportionally less loss for every setback hour. Exception: don't deep-setback heat pumps with resistive backup โ recovery spikes the strips.
Is this based on ASHRAE methods?+
The calculations follow the standard ASHRAE/ISHRAE formulations cited under the result, simplified where industry practice does the same. For permit-grade design, confirm with the full code procedure.
Is the Thermostat Setback Savings Calculator free to use?+
Yes โ completely free, no sign-up, no limits. It runs client-side in your browser, so inputs stay private and results are instant even on slow connections.
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