We got referred to this company from NYSERDA. I was unfortunate enough to be sold a bill of goods by them. ZERODRAFT is un-professional, they are a rip off. Six thousand dollars later and I still have drafts, and cold spots. Their excuse/sell, is they need to eliminate one problem at a time. $ 6000 dollars later I was done. During the job, 2 of their project managers quit and I was left to deal with the next one I have since communicated with others who had similar experiences with ZEROdraft. The are a BIGZERO of a company. DO not get sucked into buying services from them you will regret it Rick Saratoga County NY