Check voltage
Most smart thermostats are designed for low-voltage HVAC systems, not line-voltage baseboard heat.
Free smart thermostat calculator
Will a smarter thermostat pay off?
Model the device price, installation, utility rebate, expected HVAC savings and payback. Every assumption stays visible and editable.
No signupEditable savings rateRebates included
Editable calculator · 91301
Make the assumptions yours.
Before you buy
Compatibility comes first.
Inspect wiring
Confirm terminal labels and whether the thermostat needs a C-wire or approved power adapter.
Check incentives
Search your utility’s current rebate rules before purchasing; eligible models and dates change.
Frequently asked
Thermostat questions
How much can a smart thermostat save?＋
ENERGY STAR says homes with high heating and cooling bills, especially homes empty much of the day, can save approximately $100 per year. Your result depends on equipment, weather, schedules and behavior.
Does every HVAC system work with a smart thermostat?＋
No. Check system voltage, wiring, heat-pump and multi-stage compatibility, and whether a C-wire or power accessory is required before buying.
How are rebates included?＋
The calculator subtracts your editable utility rebate from thermostat and installation costs before calculating payback.
Is professional installation required?＋
Many common low-voltage systems support DIY installation, but unfamiliar wiring, line-voltage systems and complex equipment should be handled by a qualified professional.