The new year brings new minimum energy-efficiency standards for single-phase residential air conditioners and heat pumps, as well as new methods of measuring efficiencies and new terms to describe ...

Read on to learn more about energy-efficient mortgages -- including what they are, how they work, who is eligible for them, and how to get approved for one.

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.

A new tool from the Alliance to Save Energy and the Energy Efficient Codes Coalition helps planners understand just how efficient their structures can be.

There are roof shapes and ratios that maximize heat retainment and energy efficiency and, interestingly, ancient Italian architects and builders seemed to know it, too.

Energy efficiency has saved more energy than is used by the EU, China or the US according to a new report from the International Energy Agency (IEA). It is an “invisible powerhouse” for the global ...

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 US National Renewable Energy Laboratory (NREL) has updated its research cell efficiency chart for a range of PV technologies.