About Us


Everyone at Controlling Systems, Inc., has one mission: exceeding your expectations!

Our Company

Founded in 1976, we have decades of experience helping our customers to reduce their energy usage while increasing their comfort.

As a premier HVAC service contractor, we have expertise in the installation, preventative maintenance, and servicing of all heating, air conditioning, hot water heater, and IAQ products.* In addition, we offer boiler repair and replacement.

What Sets Us Apart

Our biggest advantage over the competition: our people! From the office staff to the field techs, simply put: the best in the business!

  • We have an A+ rating with the Better Business Bureau, check it out at http://denver.bbb.org/.
  • We service and install all major manufacturer's equipment.
  • We offer many different financing options to ensure we have the right program for you.
  • We give a five percent discount to military personnel and senior citizens.
  • Our technicians are NATE Certified, Factory Certified, ICC, and EPA Licensed so you know they are the best in the industry.
  • We are an independent, locally owned business, and you know that most of your comfort dollars are staying right here in the Denver community. If you aren’t satisfied with any of our services, our president, Bill East, will personally accept your call and find a solution to your issue.

Need HVAC Service?

Contact the experts at Controlling Systems.

Call us at 303-762-1421!