We have been using Ed for almost 10 years now. You cannot ask for a more honest or personable man. Please do not hesitate to call him. He has replaced our original unit, installed two thermostats for us (he just installed Nest for us--which we love), also he comes out once a year to do a check-up. My brother and In-laws have nothing but the best to say about Ed. He is very reasonably priced and does quality work.