Controlling Systems strives for customer satisfaction! We have many happy customers who would love to share their stories with you. Take a look and read all of our testimonials below. If you are ready to start your service, please call us today at 303-963-9530.

"Very Efficient!"

Very efficient and polite. Roman and his team were awesome.

Shelly M.
      "Very Efficient!"

      Very efficient and polite. Roman and his team were awesome.

      Shelly M.
      "Fantastic Work!"

      When I called they got me an appt very soon and were extremely nice. Our technician was Aireus and he was fantastic. He explained things to me and was able to fix the problem same day! Highly recommended Controlling Systems!

      Serena H.
      "Highly Recommend!"

      Two installers were sent the day of installation. They were both courteous and professional! They arrived on time and immediately dismantled the old system and prepared the space for the new system! They were very efficient and worked well together as a team. Following the completion of their work, they ran the furnace and explained the functions of the thermostat in great detail!

      I want to thank both Gemini and Roman for their attention to detail, answering our endless questions, and removing all remnants of their work! I would highly recommend this company and these two employees!

      EJ R.

      The two men that came out to install my AC/Furnace did an excellent job. They were on time, they were courteous, and always kept me in the loop as to what they were doing. Before leaving my home, they tested everything and made sure to walk me through how everything worked. I would highly recommend Controlling Systems to anyone in need of HVAC. Thank you!

      Cyndi M.
      "Top Quality!"

      Scheduled maintenance on furnace. Technician was on time, very competent and went out of his way to explain everything he was doing. He made sure the service call was covered under our maintenance contract. Service was top-quality in every respect.

      Chip B.
      "Very Pleased!"

      So far, I am quite pleased. They were quite personable and answered questions. Also quite pleased that they cleaned up after themselves.

      Shizuko H.
      "Great Job!"

      Great Job! I have a hot water/boiler heat system that gave us a mind bending problem! Not always easy to fix residential repair people that know what they are doing. Shout out to Gus and Arius for all that they did to problem solve and fix the issue. Professional, on time, great communication. I would recommend! I know I will call them in he future!

      Jill L.
      "Outstanding Service!"

      From the moment I called to set up my appointment to the in-person visit to winterize my swamp cooler, I received outstanding service. The technicians showed up on time, were totally respectful of our home, answered all my questions, and were very friendly. I thought the service was priced very fairly and that I got a great value.

      Kari K.
      "Pleasant and Knowledgeable!"

      Technician was early with a badge on his shirt identifying him as a technician with Controlling Systems. Polite, efficient, pleasant and knowledgeable! Advised on future HVAC maintenance. I highly recommend Controlling Systems and have used them for many years and will continue to do so!!

      Kathy N.
      "Professional and Friendly!"

      The heat went out at my mothers house. I called the people who installed it initially. Then called Controlling Systems. The had a technician out and it was repaired before I got a call back from the first company. Service is ALWAYS Polite, professional, friendly (big plus in my book) and efficient. Just the way I like it.

      Tomoko K.
      "Very Professional!"

      Very professional! Have used Controlling Systems for the past few years for swamp cooler start up and shut down. This time the installed a Halo water system. So far very happy with the system and continue to use their team for future needs!

      Suzanne M.
      "Amazing Service!"

      After I understood what to look for and obtain, I wanted a mini ductless system for one room, that is not connected to the rest of the ducted house. Controlling Systems sent a good rep to understand my needs, and the electrician and crew that came out for the installation were on time, good natured, and finished in half the time expected. I love the system, it works, is super quiet, and takes up little space. Big fan of Controlling Systems and Mitsubishi

      Mark M.
      "So Professional!"

      I had a great experience hiring Controlling Systems to install a Mitsubishi mini-split heat pump. The value for money was excellent, and the company clearly hires highly competent professionals. Ryan, Rudy, Josh, and Jon provided a seamless and high-quality service. I would absolutely consider working with Controlling Systems again in the future. To Management: I hope you take care of these three employees like they take care of your customers. They really did a terrific job representing your company.

      Rob Q.
      "Smooth Job!"

      Controlling Systems installed a new furnace for us years ago, and everything went as smoothly as could be, so we hired them again to install a new air conditioner this week. They had to work with an extremely tight space under the house, and were originally going to give us a slot for standard a/c filters due to the tight fit. Due to the wildfire smoke, I requested that we have space for the larger filters, and they found a way to make it happen. I could hear them singing under the house all day long, despite it being a difficult and dirty job.

      Christen S.
      "Great Experience!"

      Had a great experience with this company and each technician they send over has been outstanding. Recently I was having trouble with the heating at my house during the coldest weekend of the year and Rudy came over on a Sunday to help out. He was personable, patient and very helpful. He solved our issue and got everything running smoothly again. I definitely plan on using this company again.

      Beau S.
      "Phenomenal Job!"

      PHENOMENAL!! This is the only word I can use to describe the AC install service I recieved from the team at Controlling Systems. As a new homeowner I have found it hard to find reputable companies that are looking out for the clients best interest. Starting from the first phone call to schedule the estimate the entire team left a lasting impression that I will tell everyone and anyone who is looking for HVAC services. Ryan True was wonderful, super knowledgeable and accommodating during my estimate appointment. The week of the appointment I received both an email and a text message reminder about the appointment date and time and all of the contact information I would need for my technicians Roman & Josh. The day of my appointment Roman reached out to let me know that they were on their way. They were super professional, on time (early), and made sure to answer any and all questions that I had throughout the day. They went above and beyond, actually fixing an issue that a previous company had left behind, which was so amazing. There are a few other issues that came up throughout the install and they took care of them all making sure that I would not have anymore problems. I can not say enough good things about these two guys. USE THIS COMPANY FOR ANY AND ALL OF YOUR HVAC NEEDS YOU WILL NOT BE DISAPPOINTED!!!!!

      Lauren G.
      "Friendly and Knowledgeable!"

      I appreciated the call from the service guy letting me know that traffic was heavy so he would be 20 minutes later than he thought he would be. Friendly, kind and knowledgeable. My only suggestion would be that they wear those booties over their shoes if they are going to leave their shoes on. Thank you for the furnace repair. It's nice to have heat again.

      Debbie M.
      "Wonderful Experience!"

      Tony and Roman installed a new furnace for me and I can't tell you how wonderful the whole experience was! Quality and professional work with everything they did. Answered all my questions and went up and beyond!
      Will definitely use this Company again! Thank you!

      Maria A.
      "Pleasure To Work With!"

      Bailey and Controlling Systems were a pleasure to work with. Even with the cold weather approaching, they were able to get out to my house early the next day, had great communication, and fixed my older furnace in a quick and timely manner. I will definitely use their services again and will recommend them to anyone in need of HVAC services in the Denver area. I will absolutely call them again in the Spring for AC maintenance. Thanks again Bailey for the great, honest, and professional work.

      Matt A.
      "Amazing Job As Always!"

      Had James and Rudy out to help with some new venting and they did an amazing job as always. Can't say enough about Controlling Systems, we've been using them for all of our HVAC needs for more than 20 years.

      Jennifer G.
      "Guys Are Fantastic!"

      Long time loyal customer here. These guys are fantastic! Their last visit they re-piped some things that another contractor did - and they did not even charge me. They got my back. I trust them.

      Matthew W
      "Very Impressed!"

      The installation team was courteous and professional for the installation of our new HVAC unit. We were very impressed with their hard work and attention to detail. Would definitely recommend them to everybody!

      Karen R.
      "Professional and Amazing!"

      The work done by this company, especially Roman & Josh, was professional, and nothing short of amazing. Overcoming a few obstacles, they went above and beyond to make sure the project was done the "right way". Their workmanship, cleanliness, and overall positivity says a great deal about their training. Management and ownership should be commended because everyone's efforts are noticed. Thank you so very much for a job well done.

      Satisfied Customer.
      "Excellent Experience!"

      We had an excellent experience with Controlling Systems from the first phone call to our install. All the professionals were prompt, friendly and hard working. We had a lot of questions throughout the process and they answered every one. The prices seem right in line with the industry and we were overall very happy with their work.

      Satisfied Customer.
      "Amazing Customer Service!"

      Controlling Systems was one of four different companies that we contacted for quotes on a furnace replacement. Although we have a complicated layout (hard to get to combustion air), Gus at Controlling Systems wasn't fazed in the least. He was clear, concise and professional ? amending the proposal as i learned more and changed my needs based on what I heard from other contractors. In the end, Controlling Systems had the lowest price (in fact, nearly $1000 less for a Rheem 95% Eff. continously Variable, Dual Stage system than another contractor quoted for an 80% system) and the fastest turnaround time. The team arrived onsite at the time promised, removed the old system (not easy in my house) and installed the new system complete with new combustion air in about 6 hours ? less time that they projected and a full day fasted than another contractor quoted.

      Satisfied Customer.
      "Will Recommend!"

      We had a previous HVAC company come out and diagnosed our AC unit as having a refrigerant leak and quoted us $2100 to repair the line. This was assuming the leak was in the line, and that it was repairable. They drew up 3 quotes for a new system which I thought was odd.

      I called Controlling Systems as a second opinion, and Aireus came out. Within 10 minutes, he was not only able to find the leak (on one of the valves at the AC unit out back -- apparently a common leak spot that the other company missed), but he was also able to make a same-day repair.

      I'm 100% glad I called Controlling Systems for that second opinion. They definitely gained a customer for any future repairs. When I need a new system I also know who I'm calling.

      Dustin C.
      "Fast and Competent!"

      I just had my evap cooler repaired by Controlling Systems.  Not the least expensive, but fast and very competent.  During the heat of July 2021, they were out VERY quickly.  Their tech, Bailey, was very friendly and gracious.  Diagnosed the problem a found a part locally (brand specific motor) picked it up and returned to finish the install that day. Next gay there was a manufacture's defect, but he returned within hours and fixed it. I you are looking for a textbook case of how to run a business, this is it.  Thank you Controlling Systems.

      Marlin C.
      "Very Impressed!"

      I was impressed how quick they came out and resolved our issue.  Aireus  was our technician he was super friendly and quickly found the problem.  The price was  very reasonable.  Will be calling them in the future!

      Janine B.
      "Great Service!"

      Great service, great pricing, and great scheduling. I called Controlling Systems for a routine furnace tune up, inspection, and cleaning and Aireus did a great job. He was communicative, wore a mask, and was on time. Completed the job and made some suggestions about future work but it was no pressure and very professional. Will call them every year now.

      Mark S.
      "Exceptional Service!"

      Had some service done on my furnace. Great service. Prompt and very nice to deal with. Did a great job! Thank you for coming right out!

      J. Sara S.