Rooftop AC Unit (RTU) Installation, Repair, and Replacement Services

Rooftop AC Unit & HVAC Services

Businesses, building owners, property managers, management companies, Real Estate Investment Trusts (REITs), and commercial real estate service firms need reliable, high-performance, energy-efficient AC rooftop unit (RTU) services and commercial HVAC solutions for their complex properties.

Chiller Systems Service is a top service provider for:

  • RTU installation

  • RTU repair

  • RTU retrofit

  • RTU upgrade and replacement

  • RTU preventative maintenance needs

We deliver best-value, turnkey commercial HVAC services to enhance equipment operational performance and savings.

rooftop AC unit in Colorado

Our RTU services include:

  • Inspection and service of all brands and types of RTUs and HVAC equipment

  • Total Performance Diagnostics® reporting to determine the exact energy efficiency and delivered tonnage performance of your package AC units

  • Cooling capacity analysis and predictive energy solutions

  • High-performance system design, distribution, and installation

  • Transmission replacement and upgrades

  • Parts and supplies

  • Preventive maintenance agreements

Options include installation, repair, or replacement of all major brands of RTUs, resulting in maximum building efficiency, maximum comfort for building occupants, reduced maintenance costs, and an attractive return on your investment. No other Colorado company offers our one-of-a-kind precision air conditioning (PAC) system service programs.

Our factory-trained technicians provide custom RTU solutions for commercial, industrial, and institutional clients of all sizes throughout Metro Denver and the Colorado Front Range.


a Free Energy Analysis

Operating Costs

Long-Term Reliability

HVAC Energy Impacts

Minimize Downtime

on 24/7/365 Maintenance

Energy Efficiency

Lifetime Costs

LEED Credits/Energy Rebates

Product Sales

We service all brands of RTUs, including Carrier, Trane, Daikin/McQuay, York, and Mitsubishi. Together, we choose the best equipment and solutions to meet your needs.

commercial chiller replacement in Denver - Carrier
commercial chiller replacement - Orange Trane logo.
Commercial Chiller Service and Replacement in Denver - Blue and black York logo.
Red and black Mitsubishi Electric logo with tagline "Cooling & Heating".

Facility Maintenance Visual Intelligence

XOi enables our technicians to capture job site information, launch remote support, and share photos and videos. We’re committed to meeting the highest quality and safety standards in the industry.


We’re your trusted source for RTU installation, repair, and replacement services, as well as full-service, cost-effective commercial, institutional, and industrial HVAC solutions.

Commercial HVAC technicians at work

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Reach out today to get an RTU service quote.