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Commercial Rooftop HVAC Units

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Commercial RTU Repair and Installation in St. Cloud

Rooftop HVAC units (RTUs) — also known as packaged rooftop units — are the ideal solution for commercial buildings that need powerful, energy-efficient heating and cooling without taking up valuable indoor space. Installed on the roof, these self-contained systems combine supply and return air components in one streamlined design, providing clean, quiet comfort while allowing easy access for maintenance and repair.


RTUs are a favorite choice for offices, restaurants, retail centers, schools, warehouses, and industrial facilities across St. Cloud and Central Minnesota. They make it easy to zone temperature control, giving businesses the flexibility to customize comfort for different areas of the building — reducing energy waste, improving air quality, and maintaining consistent performance year-round.


Whether you’re planning to install a new rooftop unit or need professional RTU repair and maintenance, turn to Air Max Heating, Air Conditioning & Refrigeration. With over a decade of experience, our certified team has helped Minnesota businesses enjoy dependable, energy-efficient climate control using trusted brands like Trane, Carrier, Lennox, Daikin, Mitsubishi, and Honeywell.


Our experts specialize in all aspects of commercial rooftop HVAC systems — from return air balancing and zoning design to full RTU replacements. Every project is handled with precision, safety, and long-term efficiency in mind.


📞 Contact Air Max today for a free estimate on your commercial rooftop HVAC installation, service, or replacement — and discover why business owners across St. Cloud trust us for lasting performance and professional results.

Common Problems with RTUs

If your RTU is showing signs of problems, contact us right away. Our technicians can work quickly to mitigate damage to it or your roof, diagnose the problem, and provide a solution that can make the issue a thing of the past. 


We can address problems with:


  • Dirty coils
  • A malfunctioning thermostat
  • Air balance
  • Refrigerant leaks
  • Excessive condensation and water damage
  • Unexpected noises coming from your unit
  • Tripped breakers or blown fuses
  • Unusual odors coming from vents 
  • Inconsistent temperatures
  • Changes in humidity
  • Unexplained rises in energy costs
  • Dirty or damaged filters

We Service the Top Brands 

At Air Max Heating, Air Conditioning & Refrigeration, we are the leading provider of commercial rooftop unit (RTU) repairs, installations, and maintenance in St. Cloud and Central Minnesota. With over a decade of hands-on experience, we deliver superior service for top industry brands including Daikin, Lennox, Carrier, Mitsubishi, Honeywell, and we’re proud to be a certified Trane Comfort Specialist.


Our trained professionals are fully equipped to service all major makes and models, ensuring your system operates at peak performance year-round. When you call Air Max, there’s never a question about whether we’re the right contractors for the job — we combine technical expertise, brand-certified training, and industry insight backed by trusted resources like ACHR News, Contracting Business, and Facility Executive.


We also stay ahead of new technologies and standards highlighted by organizations such as Business Facilities, RAVTI, and Eco Home Solutions — helping our commercial clients save energy, reduce downtime, and extend equipment life.


At Air Max, we don’t send rookies to the work site — only experienced, certified technicians who take pride in their craftsmanship and customer care. Choosing us means getting maximum performance, reliability, and long-term value for your commercial HVAC investment.

For emergency services or routine repairs, call (320) 252-5602 or contact us online.

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RTU Emergency? Call Us! 

If your commercial rooftop unit (RTU) suddenly stops heating or cooling, don’t wait — call Air Max Heating, Air Conditioning & Refrigeration right away. We provide emergency RTU repair in St. Cloud and the surrounding Central Minnesota area, ensuring your business stays comfortable and operational no matter the weather.


Our experienced technicians respond quickly to diagnose the issue and schedule service at a time convenient for your business operations. We understand that a malfunctioning RTU can affect employee comfort, customer experience, and even product safety — which is why we work with speed, precision, and minimal disruption to restore your system fast.


Whether it’s a Daikin, Carrier, Lennox, Mitsubishi, Trane, or Honeywell unit, we have the expertise to get it running efficiently again. Each repair includes a full performance inspection, so you can avoid repeat breakdowns and maximize your equipment’s lifespan.


There’s a reason business owners across St. Cloud trust Air Max for commercial RTU repairs, maintenance, and replacement. We’ve helped retail centers, restaurants, medical offices, and warehouses stay comfortable and energy-efficient year-round.

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"Professional and Friendly"

Keith and his crews are awesome people to work with. Always professional and get the job done right.

- Grant K.

"Accommodating & Friendly"

We had a mini split put in my office and not only were they accommodating, friendly, but were willing to get the job done in a timely manner very polite and communicated with me through their progress. best company and team to have do your installs and repairs than you guys from Air Max for your professionalism and care while installing my AC!!!!

- Crystal D.

"Highly Recommend"

Air Max was super helpful in answering all my questions. The guys that came out were professional and knowledgeable and they cleaned up after they were done like they weren’t even there. Highly recommended company.

- Waltz J.

"Very Impressed"

This company rocks. They are dependable, reasonable, and 24/7. I had Brandon out once, and was so impressed with the service on my AC at 10:30 pm on a Saturday night, that I request him every time now. Also referred him to friends and they were thrilled with the quality too.

- Amy B.

"Great Worksmanship"

Air Max recently installed a Mini Split air conditioner in our home. We couldn't have been more pleased with their workmanship and expertise. We would recommend Air Max and their professional services to anyone.

- Carol C.

"Thorough and Detailed"

Alex was very good. Understood the problem & spent the necessary time to ensure the cleaning was completed properly.

- Dennis O.

"Highly Recommend"

I highly recommend them! Their service, pricing and professionalism was excellent. I experienced flooding and needed my furnace checked, serviced and cleaned. I was not familiar with companies in that area so was a bit nervous but they exceeded all of my expectations. They were prompt and didn't try to add things on- in fact, they went above and beyond to assist me. I will definitely us them for other services (duct cleaning) and in the future. Kala was especially helpful in coordinating my service and responding to questions. Excellent integrity and service all around.

- Jenny C.

"Very Professional"

Brendan was great to work with. Came out early in the week and a part needed to be ordered. Got the part delivered in the early afternoon on Friday. He made a special trip out at end of day Friday to complete the job! Very professional

- Nancy S.

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Need Immediate Assistance?

Our team is ready to offer emergency service for times when your HVAC system breaks down unexpectedly. Get in contact us with us for help.

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Benefits of Working with Our HVAC Experts

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