Best Heating & Air Conditioning / HVAC In Oak Creek

“Had Mike out this morning to repair our central air that went out yesterday. Not only are we grateful of the prompt service before the next heat wave, we are glad he was able to diagnose and fix the problem immediately. We will not hesitate to use them again for future needs.“

“These guys are the absolute best. Brett will look out for you and is an extremely kind respectful genuine person. I cannot stress enough that I will not use any other company for my hvac needs as long as these guys are around. If I could give 6 stars I would. You won’t regret working with them. HIGHLY RECOMMEND. Professional, quick and very top notch work“

“Replaced our 20 year old AC with Diversified. Working with John and crew was fantastic. Very happy with the price, the install, and how quickly they were able to get it done!Service: Install AC“

“These guys deliver for my restaurant. Usually I get a technician in the next day for a service call, but not making any promises for them: that’s just my experience.Multiple calls have been completely paid for with freezer/fridge warranty coverage, so that’s awesome they do that follow-through for the customer. Their pricing is a little below average for the market otherwise for service calls.Technicians are knowledgeable and very nice. Very quick and efficient when I have seen them at work.Understand that they have a receptionist who takes the initial call, and then you will get a call from their repair manager. People are mean on these reviews. Quality kitchen refrigeration and HVAC isn’t ever going to be cheap, people!“

“We decided we needed a new hot water heater. Our current heater still worked but was over 15 years old and we knew it was time for a replacement. We have worked with The Thielmann Group for nearly thirty years for all of our heating and cooling needs so we naturally asked them for estimates on a hot water unit. We were thrilled with the selection they offered as well as the pricing. Kevin C and his associate came out today and did an excellent job installing the new heater. They were right on time, efficient, courteous and knowledgeable. We couldn’t be happier with the job they did and feel good knowing we won’t have any issues in the future with water problems. We recommend Thielmann for all heating cooling and hot water heater services.“

“Mr. Demos is a very polite, respectful, and over all an amazing person! He came to my home for an HVAC inspection to find out what is wrong with my heater. He helped me get an understanding of how the circuitry works and why my heater wasn't working. I highly recommend Mr. Demos to anyone who needs help with their HVAC system.“