Their efficiency is measured by annual fuel utilization efficiency (AFUE)—the ratio of the appliance's annual heat output compared to the total amount of fossil fuel energy taken in over a year.

The ratio (between 8 and 15) and estimated energy cost per year for your appliance can be found in the Energy Guide listed by the manufacturer.

While higher SEER ratings generally offer better efficiency, the optimal choice depends on local climate conditions, usage patterns, and your long-term energy-saving goals.

The 2023 requirements come from the U.S. Department of Energy (DOE), which reviews efficiency standards for HVAC products every six years. Instead of EER, SEER, and HSPF (Energy Efficiency Ratio, ...

By plugging some basic info about your AC unit and usage into a few simple formulas, you can calculate the cost of running AC. Energy Efficiency Ratio (EER) Formula An AC unit’s Energy ...

You can tell how efficient a window AC unit is by its CEER rating, or combined energy efficiency ratio. That’s a ratio of cooling capacity, measured in British thermal units per hour (Btu/h), to ...

The "big beautiful bill" ends tax credits for solar panels, heat pumps, and other home energy projects after 2025. Act fast, though, and you can still qualify.

The energy footprint could go up to 50, 60 or even 70 kilowatts per server rack. Data centers are currently using 10-15 kilowatts, and that too in very extreme environments.