ID 78394230 © Valigursky | Megapixl.com
Sharing is not just caring, it's also about giving credit - add this image to your page and give credit to the talented photographer who captured it.:
alternative architecture areal arrow building chimney classic closed colonial coupled detached diagram door energy environment exchanger floor geothermal ghp ground heat heating home horizontal hot house illustration loop model planar power pump renewable source system technology temperature underfloor warm warmth water window