My 80% efficient downstairs furnace and ac needed upgrading so I contacted several Trane and Lennox dealers. Air Assurance came to me via Home Depot, where I would get a 10% military discount. The bid process took about a week while I weighed the cost/benefits of the various Lennox Signature products, finally deciding on a 98.7% SLP98 90 kbtu furnace, a 25 SEER XC25 4 ton air conditioner and an S30 wi-fi thermostat. Several companies gave me bids but Air Assurance beat them by thousands. Another dealer (AIRCO) suggested that Air Assurance was not reputable and used inferior materials and work practices but after contacting several recent (and happy) customers and speaking with the company owner I was convinced this was not true. So I went with Air Assurance and I am extremely glad that I did. Before selecting the vendor, Air Assurance had their quality manager come out and do air flow studies of the ductwork and heating and cooling requirements. It was suggested that I might need an additional return and supply duct to handle the larger system (I was replacing a 3.5 ton). Air Assurance indicated that any duct changes or other requirements to meet factory specifications and local codes was included in the bid-no surprises. The work was done over two days by a 3 person crew. Extremely professional, they pulled down all the cheap duct board and duct tape of my old system and installed custom-measured, insulated metal ductwork sealed with mastic. All my old dangling power and thermostat wires were shortened and placed inside conduit. Equipment was placed straight, even compensating for duct openings not lined up with the closed walls. They inspected every floor outlet and squared up bent sheet metal and bonded the metal duct to the concrete foundation so there were no leaks. They also used poles to access as much as the non-ducted, between joists, air return and seal openings and irregularities in the chases. A new return was added to my utility room wall where it is barely noticeable, but no new supply ducts were needed because the new air flow was balanced. The crew chief happened to notice a gas line problem on my newly-installed tank-less hot water heater (done by another company) and proceeded to re-plumb the line without any charge to me. The day before Air Assurance sent a team of plumbers out to move a sprinkler back flow preventer that would be partially blocking the new furnace. Again at no additional charge. My AC condenser is a monster and had to be several feet from the house to meet code but it is extremely quiet, even at full speed. In summary, I would recommend Air Assurance to anyone wanting plumbing or heating/ac work done. They are professional, courteous and deeply care about the quality of their work and how it is perceived by their customers.