Rooftop Unit Repair
RTUs sit on the roof in sun, wind, snow and hail. We diagnose failed compressors, blower motors, control boards, sensors and gas-heat components, and repair the unit in place wherever the fault allows.
Rooftop units, shop heating and cooling
Commercial HVAC Fort Collins for Shops, Restaurants and Offices
Commercial HVAC in Fort Collins means keeping a business open: the rooftop unit over the shop, the heating that keeps staff and customers comfortable through a Front Range winter, and the cooling that holds through a July afternoon. DNA Refrigeration Heating & Cooling services, repairs and installs commercial HVAC for Fort Collins businesses, and we are open 24 hours, 7 days a week. Call (970) 932-2324 any time, day or night.
Rooftop units, serviced and repaired.
About this service
Commercial HVAC Work for Fort Collins Businesses
A failed rooftop unit is not a household inconvenience. It is a closed dining room, a shop that cannot open, or staff working through a shift in a building that will not hold temperature.
DNA Refrigeration Heating & Cooling works on the commercial HVAC systems that Fort Collins businesses actually run: rooftop units (RTUs), packaged heating and cooling equipment, and the split systems that heat and cool shops, restaurants, cafés and small offices. Our commercial customers include multi-location operators — one customer has us looking after nine locations — and the work is the same at each site: keep the equipment running, fix it when it stops, and plan replacements before a failure forces one.
Fort Collins is a heating-first market. The city sits in IECC climate zone 5B, with 5,797 heating degree days against 624 cooling degree days (NOAA 1991–2020), so a commercial heating failure in January matters more than a cooling failure in July — though July matters too, when a dining room full of customers and a kitchen full of heat-producing equipment push a rooftop unit hard. At 5,003 feet of elevation, gas furnaces derate roughly 10–20% and air conditioning loses roughly 10–20% of its sea-level capacity, so equipment sized from a sea-level catalogue is undersized here. Commercial equipment has to be sized for Fort Collins altitude, not for a generic catalogue.
Our commercial focus is service, repair, replacement and maintenance for existing buildings. We do not present ourselves as a new-construction contractor: the design and installation of HVAC for buildings that do not exist yet is a different trade, and our work is keeping the buildings that are already open, open. If your rooftop unit is short cycling, blowing warm air, tripping breakers, leaking, or simply old and unreliable, that is the work we do.
One dated note for rooftop-unit customers: in August 2026 DNA Refrigeration posted on its Google Business Profile, “10% off new rtu installs, mention this ad.” That was a post from August 2026, not a standing discount, and it is recorded here as such. Ask when you call whether any current offer applies to your job — we will not quote a discount that is no longer running.
HVAC work in Fort Collins is licensed by the City of Fort Collins, not the state — Colorado licenses only electricians and plumbers at state level. Fort Collins licenses HVAC contractors through the City — ask us for our licence details when you call.
- ✓ Rooftop unit (RTU) repair and installation
- ✓ Commercial heating and cooling maintenance
- ✓ Multi-location commercial customers
- ✓ Open 24 hours · 7 days a week
What’s included
What Our Commercial HVAC Service Covers
Commercial systems are bigger, harder to reach and harder on a business when they stop. Here is what the service covers, in plain terms.
New Rooftop Unit Installs
When a rooftop unit is beyond sensible repair, we install its replacement — sized for Fort Collins altitude and the building’s actual heating and cooling load, with venting and commissioning done as part of the job.
Commercial Maintenance
Regular maintenance is how a nine-location operator keeps nine shops running: scheduled visits that check operation, clean what needs cleaning, and catch a failing part before it becomes a closed day.
Shop Heating and Cooling
Shops, cafés and small offices run a mix of rooftop units and split systems. We work on the heating and cooling equipment a working business depends on, not just the equipment in a house.
Altitude-Aware Sizing
At 5,003 feet, gas heat derates roughly 10–20% and cooling loses roughly 10–20% of sea-level capacity. A replacement sized from sea-level figures is undersized here; we size for Fort Collins conditions.
Plain Explanations, No Pressure
We explain what failed, what the repair involves, and what a replacement would involve, and let you decide. We do not exaggerate work that does not need doing — that is a customer’s own description of how we work, and we intend to keep it true.
How it works
What to Expect From a Commercial HVAC Call
Call (970) 932-2324 and tell us what the unit is doing, what kind of building it serves, and whether the business can stay open while we work. We are open 24 hours, 7 days a week.
We look at the unit on the roof or in the mechanical space, check its operation, and find the failed component rather than guessing at it.
We explain the repair, what it involves, and — where the unit is old or the repair is large — what replacement would involve, so you can weigh a repair against a new unit.
We carry out the agreed repair or the replacement install, then run the system through a full heating or cooling cycle and check that it holds temperature.
For businesses with several units or several locations, we talk through a maintenance schedule so the next failure is caught on a planned visit, not on a busy trading day.
STEP 01Call and Describe the Problem
Call (970) 932-2324 and tell us what the unit is doing, what kind of building it serves, and whether the business can stay open while we work. We are open 24 hours, 7 days a week.
Problems we solve
Commercial HVAC Problems We Fix in Fort Collins
A rooftop unit that stops on a trading day costs more than the repair. These are the problems Fort Collins businesses call us about.
Ask a pro →Rooftop unit not heating or cooling
We test the compressor, blower, controls and gas-heat components to find the failed part, then repair or replace it and confirm the unit holds temperature through a full cycle.
Rooftop unit short cycling
A unit that starts and stops every few minutes is usually a control, sensor or airflow fault. We find the cause rather than replacing parts at random.
Uneven temperatures across the space
Hot and cold spots in a shop or dining room are often an airflow, ductwork or sizing problem. We check how air is actually moving through the building before recommending a fix.
An ageing unit that keeps breaking down
When repairs stack up on an old rooftop unit, we lay out the repair against a replacement — including the August 2026 RTU post, where it still applies — and let you decide on the numbers in front of you.
Customer reviews
What Fort Collins Customers Say
DNA Refrigeration Heating & Cooling holds a 5.0-star rating across 23 Google reviews. These reviews are quoted verbatim from Google.
★★★★★
“Denis always does a great job taking care of our 9 locations. Goes above & beyond to make sure our shops stay running smoothly. We have him do walk-in installations & maintenance, HVAC installation & maintenance, ice machine maintenance & installations, preventative maintenance & repairs on all of our sandwich tables and cabinets.”
TL
Tom LoftusCommercial customer, 9 locations
✓ Google review“
★★★★★
“Great Company great service I use them for all my refrigeration and hvac needs”
DC
David CheelyCommercial customer
✓ Google reviewWe service, repair and install rooftop units and other commercial heating and cooling equipment for shops, restaurants, cafés and small offices in Fort Collins, and we carry out commercial HVAC maintenance. Our commercial customers include multi-location operators. We focus on existing buildings rather than new construction.
In August 2026 we posted “10% off new rtu installs, mention this ad” on our Google Business Profile. That was a dated post from August 2026, not a standing discount. Ask when you call whether any current offer applies — we will not quote a discount that is no longer running.
Yes. DNA Refrigeration Heating & Cooling is open 24 hours, 7 days a week. Call (970) 932-2324 any time, day or night.
No. Colorado has no state HVAC licence; the state licenses only electricians and plumbers. HVAC work in Fort Collins is licensed by the City of Fort Collins, and Fort Collins licenses HVAC contractors through the City — ask us for our licence details when you call.
Ready when you are
Get Commercial HVAC Help in Fort Collins
Call (970) 932-2324 any time, day or night. Tell us what the unit is doing, how many units the building has, and whether the business can stay open while we work — we will talk through the next step with you.
Call Now (970) 932-2324 →
Get in touch
Get in Touch
Call (970) 932-2324 any time, day or night. DNA Refrigeration Heating & Cooling is open 24 hours, 7 days a week, for Fort Collins homes and businesses. There is no email address for the business, so the phone is the way to reach us.
Call anytime(970) 932-2324
Office hoursOpen 24 hours · 7 days a week
Address2757 Sternwheeler Dr, Fort Collins, CO 80524