Smart Home Investment Calculator
Smart home devices range from smart thermostats and LED lighting to water leak sensors and smart power strips. While many are purchased for convenience, they also generate measurable annual savings on energy and utility bills. The EPA ENERGY STAR program certifies products that meet energy efficiency standards and provides independently verified savings estimates. This calculator aggregates savings across common smart home device categories to show total annual savings, total investment cost, and the payback period.
Smart home ROI formula
Total Investment = Thermostat Cost + Lighting Cost + Other Costs
Annual Savings = Thermostat Savings + Lighting Savings + Other Savings
Payback Period = Total Investment / Annual Savings
10-Year Net Savings = (Annual Savings x 10) - Total Investment
Savings estimates are based on ENERGY STAR and DOE published figures. Smart thermostat savings of $50/yr are the EPA-published average for ENERGY STAR certified models. LED lighting savings are based on DOE estimates of 75% energy reduction versus incandescent at the average US residential electricity rate of approximately $0.16/kWh (EIA 2024 average).
Highest-ROI smart home investments
- Smart thermostat: fastest payback period (typically 1 to 3 years) with ENERGY STAR certification and utility rebates often available in most states.
- LED lighting: extremely fast payback when replacing incandescent bulbs; smart LED bulbs add scheduling and dimming for further savings.
- Smart power strips: eliminate standby power waste from electronics; the EPA estimates standby power accounts for 5% to 10% of household electricity use.
- Water leak sensors: low cost ($20 to $50 each), zero ongoing cost, and can prevent thousands of dollars in water damage.
- Smart irrigation controllers: the EPA WaterSense program certifies smart irrigation controllers that can reduce outdoor water use by 50% versus traditional timers.
Smart home investment: frequently asked questions
Do smart thermostats really save money?
Yes. The EPA ENERGY STAR program has certified smart thermostats and reports that a smart thermostat can save approximately $50 per year in heating and cooling costs on average. Homes in climates with extreme winters or summers can save $100 to $200 per year. The most popular smart thermostats cost $150 to $250, giving a payback period of 1 to 2 years.
How much do smart LED lights save?
Replacing incandescent bulbs with LED bulbs saves approximately $50 per year in electricity costs for a typical home. The Department of Energy estimates LED bulbs use at least 75% less energy and last 25 times longer than incandescent bulbs. At average US electricity rates, a 60W incandescent replaced with a 9W LED saves about $10 per bulb per year.
Do smart home devices add value to a home?
Smart home features have become increasingly desirable to buyers. A study by Coldwell Banker found buyers are willing to pay a premium for homes with smart technology, particularly smart security systems and smart thermostats. While hard resale value data varies, smart home features are generally considered positive by buyers and may help a home sell faster.
What is a smart water leak detector and how much can it save?
A smart water leak detector ($20 to $60 per sensor) alerts you instantly when water is detected under sinks, near water heaters, or around appliances. Undetected water leaks cause an average of $11,000 in water damage claims (Insurance Information Institute). One prevented leak can save thousands of dollars in deductibles, repairs, and increased insurance premiums.
Are smart plugs and power strips worth it?
Smart plugs ($15 to $30 each) allow you to turn off devices remotely and track energy use. The EPA estimates that standby power (devices left on or in standby) accounts for about 5% to 10% of household electricity use. In a home spending $1,500 per year on electricity, eliminating standby waste can save $75 to $150 per year.
Official sources
- EPA ENERGY STAR: Smart Thermostats.
- U.S. Department of Energy: LED Lighting.
- U.S. Energy Information Administration: Electric Power Monthly (electricity rates).
Reviewed by the CalculatorHub team, edited by James Graham, 14 June 2026. See our methodology.