Energy Star Comparison Calculator

Energy Star is a voluntary certification program run by the U.S. Environmental Protection Agency (EPA). Products that earn the Energy Star label are independently tested and certified to meet strict energy efficiency guidelines, helping consumers save money on utility bills while reducing greenhouse gas emissions.

Savings vary by appliance type, usage, and local electricity rates. On average, an Energy Star certified central air conditioner can save 8–15% versus a standard model, while an Energy Star refrigerator can save around $150 over its lifetime. The EPA estimates the average household spends over $2,200 a year on energy, with nearly half going to heating and cooling — making HVAC upgrades the highest-impact choice.

Yes. A smart thermostat can add an additional 8–15% in heating and cooling savings by automatically adjusting temperatures based on your schedule and preferences. This calculator accounts for smart thermostat use when estimating HVAC savings.

You can find your electricity rate on your monthly utility bill — it's usually listed in cents per kilowatt-hour (kWh). The U.S. national average is approximately $0.16/kWh, but rates vary significantly by state, ranging from around $0.10/kWh in some southern states to over $0.30/kWh in Hawaii and parts of the Northeast.

Yes. Many utility companies offer rebates for upgrading to Energy Star certified appliances. Additionally, the federal Inflation Reduction Act (IRA) includes tax credits (Section 25C) of up to 30% for qualifying Energy Star heat pumps, water heaters, and other home upgrades. Check the ENERGY STAR rebate finder at energystar.gov for offers in your area.

The payback period is the net upgrade cost (purchase price minus rebates) divided by the annual energy savings. For example, if an Energy Star AC costs $1,000 more than a standard model after rebates, and saves $200 per year in electricity, the payback period is 5 years. After that point, all savings are pure financial gain.

HVAC systems (central air conditioners and heat pumps) typically offer the largest absolute dollar savings since heating and cooling account for nearly half of home energy costs. Water heaters and refrigerators also offer strong returns. Windows tend to have longer payback periods but improve comfort significantly.

Older appliances are generally much less efficient than modern Energy Star models. A central AC unit installed before 2006 may have a SEER rating of 8–10, while a current Energy Star model can achieve SEER 16 or higher — meaning it uses 40–60% less electricity for the same cooling output. The older your current system, the greater your potential savings from upgrading.