One Hour Heating & Air Conditioning® of St. Louis 6068 Baumgartner Industrial Drive, St. Louis, MO 63129

"Dunn One Hour did the entire design, install and finish work on our new home. Very challenging house design and we went through several contractors before choosing Dunn. Awesome communication, best equipment, great design and followed up tuning the system after we moved in. Could not be happier."

"Our furnace waited until the coldest day of the year to quit and One Hour responded beautifully. Erik came out promptly and was very clear and direct in manner. He gave us a bid and bent over backwards to answer all of our many questions. The install team showed up, first thing this morning, and got busy. They finest up only minutes ago and the house is well on its way to being comfortable again. Fantastic work!"

"Nathan and his helper did a very good job. They explained what was being done and explain what the different parts were doing. I just like to know how things operate that's why I asked a lot of questions. The job was done neatly they were very professional in their work and I would recommend them very highly to anybody needing work on or replacement of their heating air conditioning and probably water heating systems. Thank you again for doing great job. Have good holidays"

"I called Dunn Heating and Cooling out to look at a unit that was improperly installed 1 year ago by a company just starting out. The HVAC unit had some issues over the past year. So I called another company for suggestions. The technician from Dunn was very knowledgeable and gave me options as to a fix or a replacement. I highly recommend them."

"Very grateful for Rob coming out today representing Dunn HVAC Service. Quick easy call in schedule system, made this process a breeze. Rob was very thorough with the AC diagnosis and was straight forward in his answers; which I appreciated a lot. We decided with fall coming we will forgo without fixing the AC for the winter and reconvene next year in the warmer months."