Reviews


Boiler Replacement in Denver, CO 80206

“An HVAC company that does what they promise, in reasonable time, for market-reasonable cost? With pleasant humans throughout the process?? Unheard of. Until I hired Controlling Systems to replace my 14-year buggy radiant home heating and on-demand hot water system. Seven of the contractors who looked at my mess earned a spot on the spreadsheet comparing contenders. Some said stupid salesy-desperate things like, “ours is the only high-efficiency unit on the market,” and, “only ours is the top model.” Ich. Bailey’s deep knowledge and clear, straightforward communication earned my trust, and then he followed through! Over the years I’ve paid a LOT of HVAC guys to not fix the prior system, or clearly recommend actual replacement options, featuring the outcomes I could expect, especially concerning heating the cold spots in the house. What a breath of fresh (warm!) air: with Gus’ smiling assistance, Bailey expertly installed a new unit, which runs economically, quietly, and I can trust, reliably for many years to come. 10 stars!”
- Jen S.

Gas Furnace Repair in Denver, CO 80227

“Best service call I’ve ever received!! Showed up super fast, within an hour of me calling. Bailey was excellent, super professional, super polite and very knowledgeable and actually showed me how my furnace worked! Super helpful! He came in and actually fix the furnace quickly ! Very happy with your company and with Bailey and I guarantee I’ll be calling again with any other problems in the future. Highly recommend your company! Thank you so much!”

- Aspen S.

Air Conditioner Replacement in Aurora, CO 80012

“Roman and John replaced a central a/c unit and water heater. Great experience from initial evaluation to estimate to install process. I rehired Controlling Systems after they did an extensive furnace/ductwork replacement project and installed a new central a/c system in my previous home. Their teams are courteous, efficient and very skilled. Five star service”

- Julia R.

Air Conditioner Installation in Denver, CO 80232

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

- Shizuko H.

Other Replacement in Thornton, CO 80020

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

- Shelly M.

Air Conditioner Replacement in Commerce City, CO 80022

“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.

I would highly recommend this company.

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.

Recommend Controlling Systems

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

Service was top-quality in every respect.

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.

Professional, on time, great communication.

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.
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