ONE Service Pros: A Trustworthy HVAC, Plumbing and Electrical Company Your HVAC, plumbing and electrical systems must function properly for your peace of mind. At ONE Services Pros, our job is to make sure that happens. Here’s why home and business owners in the greater Knoxville area continue coming to us: Woman-owned small business that offers a money-back guarantee. Provide fast, reliable and affordable HVAC, plumbing and electrical services. Work according to our slogan, “ONE CALL, we can do it all!” Believe in kindness, ambition, communication, accountability and integrity. Guarantee all our HVAC, plumbing and electrical work for one ye...