Heat pump vs furnace
See if a heat pump pays off against your oil, propane or gas heat. Enter your fuel use and prices and get the payback in years. Free, runs in your browser.
Does a smart thermostat pay?
Compare the device price, installation, and instant utility rebates against annual heating and cooling bill reductions and peak demand-response credits.
8-year net savings
$1,415
Net 8-year savings after $145 upfront cost
Example calculation
Yes, smart thermostat pays
At a net upfront cost of $145, your smart thermostat saves $179 in year 1, breaks even in 9.7 mos, and delivers $1,415 in net savings over 8 years.
Net upfront cost
$145
$220 gross minus $75 rebate
Payback period
9.7 mos
0.8 years to break even
Year-1 savings
$179/yr
8% HVAC + $35 peak credit
Total gross savings
$1,560
cumulative over 8 yearsSide-by-side breakdown
| Metric | Keep current thermostat | Install smart thermostat |
|---|---|---|
| Device + installation cost | $0 | $220 |
| Instant utility rebate | $0 | -$75 |
| Net out-of-pocket cost | $0 | $145 |
| Year-1 HVAC + peak credit savings | $0/yr | $179/yr |
| Payback timeline | N/A | 9.7 mos |
| 8-year net financial gain | $0 | +$1,415 |
Year-by-year savings and payback schedule
Annual heating and cooling reductions, utility peak-rush credits, and cumulative net cash flow.
| Year | HVAC bill savings | Peak-rush credit | Total annual savings | Cumulative savings | Net position |
|---|---|---|---|---|---|
| Year 1 | $144 | $35 | $179 | $179 | +$34 |
| Year 2 | $148 | $35 | $183 | $362 | +$217 |
| Year 3 | $153 | $35 | $188 | $550 | +$405 |
| Year 4 | $157 | $35 | $192 | $742 | +$597 |
| Year 5 | $162 | $35 | $197 | $939 | +$794 |
| Year 6 | $167 | $35 | $202 | $1,141 | +$996 |
| Year 7 | $172 | $35 | $207 | $1,348 | +$1,203 |
| Year 8 | $177 | $35 | $212 | $1,560 | +$1,415 |
Sensitivity to HVAC bill savings
How your payback timeline and 8-year net gain shift with actual heating and cooling reduction:
| HVAC savings % | Year-1 total savings | Payback period | 8-yr net savings |
|---|---|---|---|
| 4% | $107/yr | 16.3 mos | +$775 |
| 8% (yours) | $179/yr | 9.7 mos | +$1,415 |
| 12% | $251/yr | 6.9 mos | +$2,056 |
| 15% | $305/yr | 5.7 mos | +$2,536 |
How this calculator works
We subtract instant utility marketplace rebates from the thermostat device and installation cost to find your net upfront outlay. Each year, your heating and cooling bill reduction grows with utility rate inflation and combines with annual demand-response credits to compute exact fractional payback months and cumulative net savings over the thermostat's lifespan.
What to watch out for
Energy Star's 8% savings benchmark compares a smart thermostat against keeping a constant comfort temperature. If you already religiously dial back a manual or programmable thermostat every night and whenever you leave the house, your incremental savings may be closer to 2% to 4%.
Frequently asked questions
How much does an Energy Star smart thermostat actually save?
Field studies reviewed by the EPA ENERGY STAR program show an average 8% reduction in heating and cooling bills (about $140 to $180 per year for a typical U.S. home), driven by phone-based geofencing, occupancy sensors, and automatic seasonal scheduling.
Do I need professional installation or a C-wire?
About 80% of homeowners install a smart thermostat themselves in under 45 minutes using the included C-wire adapter kit. Hiring an HVAC technician ($125 to $200) is only necessary if your furnace control board lacks standard low-voltage terminals or uses high-voltage baseboard line wiring.
What are utility peak-rush or demand-response credits?
Many electric utilities pay an upfront $50 to $100 enrollment bonus plus $25 to $50 each summer if you let them pre-cool your home and raise your thermostat setpoint by 2 to 3 degrees during a handful of afternoon grid-peak events. You can override any event from your phone without penalty.
Benchmark sources and dates
Starting assumptions are example benchmarks, not binding quotes. Change any input to match your own bills or offers.
| Assumption / Input | Starting value | Source | Checked |
|---|---|---|---|
| Smart thermostat device cost | $220 | ENERGY STAR Smart Thermostats Product Finder | 2026-10-13 |
| Utility marketplace rebate | $75 | ENERGY STAR Rebate Finder | 2026-10-13 |
| Annual heating and cooling bill | $1,800/yr | U.S. Energy Information Administration Residential Energy Consumption Survey | 2026-10-13 |
| Certified HVAC bill savings | 8% | ENERGY STAR Smart Thermostats Savings Methodology | 2026-10-13 |
| Demand-response annual credit | $35/yr | U.S. Department of Energy Grid-Interactive Efficient Buildings | 2026-10-13 |