Note: Article originally published on January 24, 2016. Content and graphics revised on December 27, 2021. Question for Our Experts: I’ve heard about residential solar energy systems that require solar…

Note: Article originally published on July 14, 2014. Content and graphics revised on December 27, 2021. Question for Our Experts What is a heat pump? Air conditioners are pretty straightforward. So are…

Note: Article originally published on June 30, 2016. Content and graphics revised on December 27, 2021. If you own a home or business, you’d probably sign up in a heartbeat…

Note: Article originally published on March 4, 2013. Content and graphics revised on December 27, 2021. In this series, our experts address some of the most common and helpful questions…

Note: Article originally published on December 13, 2019. Content and graphics revised on December 27, 2021. Imagine it’s a cold winter morning in Pennsylvania. You wake up to a chilled…

You might have heard that programmable thermostats may lead to significant cost and environmental savings — but are programmable thermostats really worth it? This is a smart question, but it’s impossible…