I cannot recommend Benchmark Service highly enough. Jack's knowledge of HVAC systems is vast and is complemented by a background in general contracting that allows him to see the "whole picture." He has the unique perspective of understanding all of the working parts in a home, which helps him to quickly diagnose problems and suggest the best and most cost effective solutions. Jack and his business partner, Jose, are professional, knowledgeable, and courteous, and their attention to detail is truly remarkable and refreshing. Every time Benchmark Service has completed work for me I am thoroughly impressed with the product, which is why I have referred them to everyone I know. I assure you, this is a man you want on your home maintenance team! Kevin and Heidi Maher Winnetka Heights Mitsubishi | Our Credentials | Allergy Relief | See Us In Action!