G Force was one of 4 companies we asked to quote on repairing/ replacing our furnace, adding a ductless unit to our reno'd 3rd floor, and moving some bsmt duct work. Mark G came promptly and more importantly, came armed with a boatload of expert advice, experience and respect. (You'd be amazed at the attitude I've seen from some service providers when they encounter a woman who is directing home reno projects. Hello 1850s, not-so-nice to see you again.) He quickly assessed the problem with our furnace and provided intelligent recommendations & a thorough quote. Woody and the team worked very hard for a long, long day installing the new furnace and moving our ductwork, as did the team that installed the ductless A/C. Mark came by several times during our multi-phase project to provide advice, answer questions, and address new issues as they arose - such as moving a 3rd flr vent on short notice - and was great about providing the appropriate paperwork for green rebates, etc. Full marks for great work as our 'partner' in our reno project; I have already recommmended to friends & family and will continue to do so.