WattMath

Smart Thermostat Savings Calculator

Calculate how much you can save with a smart thermostat. See estimated savings from geofencing, learning algorithms, and smart scheduling based on your HVAC costs and lifestyle.

HVAC & Thermostat Details

Popular options: Nest ($130-250), Ecobee ($170-250), Honeywell ($150-200)

Smart Thermostats

Smart thermostats can reduce HVAC energy use by 10-15% through learning algorithms, geofencing, and optimized scheduling. The EPA estimates average savings of 8%.

  • Average payback: 1-2 years
  • Best savings: homes empty during workday
  • Many utilities offer $50-100 rebates

How to Use

  1. Select your heating and cooling system types
  2. Enter your annual heating and cooling costs from utility bills
  3. Choose your current thermostat type and occupancy pattern
  4. Enter the cost of the smart thermostat you're considering
  5. Click Calculate to see your estimated savings and payback period

FAQ

Which smart thermostat should I buy?

Popular choices include Nest Learning Thermostat, Ecobee SmartThermostat, and Honeywell Home T-series. Ecobee includes room sensors for better multi-room comfort. Check compatibility with your HVAC system before buying.

Do smart thermostats work with all HVAC systems?

Most work with standard 24V systems (furnaces, central AC, heat pumps). High-voltage systems (baseboard heaters) need specific models. Check for a "C-wire" in your current thermostat - some smart thermostats need it, though many include adapters.

Will I save if I'm home all day?

Yes, but less than someone who's away regularly. You'll still benefit from learning algorithms, automatic night setbacks, energy reports, and avoiding forgotten adjustments. Expect 5-8% savings instead of 10-15%.