I contracted with Jacobs Air Conditioning & Heating to replace a 20 year old HVAC system and duct work in my 100 year old home. It was a difficult and dirty job, and while it took a little longer than anticipated (it WAS a 100 year old home, after all), I now have a highly efficient and well-designed system that I expect to provide many years of trouble-free service. I would recommend highly recommend Jacobs.