Penn State study of 18,000 U.S. homes shows heat pumps, thermostats, and efficient appliances can cut energy use and lower household costs.

Drill and Fill: Installers thread pipe into a hole a few inches wide and over 100 feet deep. As wind and solar hog the alt-energy spotlight, this technology has remained underground. "You're not ...

A & A Companies helps explain why some easy maintenance techniques can save your HVAC system from high repair costs.

Abstract: This paper proposes a business model based on bidding strategy for the wind power plant and district heating system (WPP-DHS) portfolio considering ancillary service of frequency regulation.