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Full Time Heating & Cooling
Full Time Heating & Cooling · Watertown, MN

Commercial HVAC Repair for Small Businesses in the West Metro

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24/7 Emergency Service5.0 Rating · 200+ Google ReviewsMN Bonded #MB792165NATE-Certified Technicians
Commercial HVAC Repair for Small Businesses in the West Metro
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Actual Service Calls

A Commercial Rooftop Repair That Caught a Second Problem

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This example shows how we approach commercial RTU service calls: fix what we were called for, then keep an eye on the rest of the system while we're already on the roof. Repair needs and costs vary by system. Details below come from our technician notes, invoices, and the corresponding Google review.

Commercial Rooftop HVAC Repair in Waconia Caught a Second Problem

During a commercial rooftop HVAC service call in Waconia, our technician replaced a power roof vent serving a second-floor common area.

While working on the roof, the technician noticed that a second rooftop air conditioning unit was cycling on and off rapidly. Rather than leaving it for another service call, the technician tested the system and determined that it was cycling on low pressure because it was low on refrigerant.

The property owner was given repair options and chose to address the problem during the same visit. The technician added 2.3 pounds of R-410A refrigerant along with a UV leak-stop additive, then tested the system again.

Service location: Waconia, MN
Repair completed: August 2025
Repair cost: $1,456
Repair time: About 2 hours
Work completed: Power roof vent replacement plus diagnosis and repair of a second rooftop HVAC unit
Result: Two commercial HVAC issues were addressed during the same visit, avoiding the need for a separate service call.

“On time, good value, recognized another issue on site and addressed it immediately vs. having a separate service call which kept tenant comfortable and equipment from not being damaged further. Very pleased.”
John W. | Waconia, MN | August 2025

What We Actually Repair on Commercial Systems

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Commercial HVAC failures aren't always dramatic. Sometimes it's a rooftop unit that's been short-cycling for three weeks before someone notices the energy bill. We diagnose and repair the full range of commercial heating and cooling equipment common to small and mid-size commercial buildings in the West Metro.

Rooftop Units (RTUs)

The workhorse of small commercial buildings. We diagnose compressor issues, failed economizers, refrigerant leaks, heat exchanger cracks, and control board failures on packaged rooftop units from most major manufacturers.

Split Systems in Commercial Spaces

Not every commercial building runs on RTUs. Smaller offices, retail suites, and storefronts often run standard split systems. We repair these the same way we handle residential work: diagnose first, replace only what's failed.

Commercial Gas Furnaces and Unit Heaters

Warehouses, shops, and industrial spaces rely on unit heaters and commercial gas furnaces. We repair ignition systems, gas valves, heat exchangers, and venting issues. A failed unit heater in a Minnesota January isn't something to schedule for next week.

Zone Control and Thermostats

Multi-zone commercial systems fail at the control layer more often than people expect. Bad zone boards, failed actuators, and mis-wired thermostats create comfort complaints that look like equipment failure. We trace the actual fault before pulling any hardware.

Refrigerant Issues and Leak Repair

Low refrigerant isn't a system quirk you can ignore. A commercial system slowly losing charge is running inefficiently and heading toward compressor failure. We locate the leak, repair it, and recharge the system to manufacturer spec.

Electrical and Controls Failures

Contactors, capacitors, control boards, and wiring failures account for a large percentage of commercial HVAC calls. These are often faster and cheaper to fix than the symptom suggests. Diagnosis is the step that separates a $200 repair from an unnecessary $8,000 replacement.

The Diagnostic Process We Follow on Every Commercial Call

We don't show up and start recommending equipment. The first step is always a full system diagnostic: check electrical, check refrigerant pressures, check heat exchanger integrity, pull fault codes, and verify what the controls are actually doing versus what they're supposed to do. On commercial equipment, symptoms often point in the wrong direction. A building that won't cool might have a failed economizer stuck in the open position, not a compressor problem. A system that keeps tripping the breaker might have a wiring fault, not a bad motor. We find the actual cause before we quote anything. If the diagnosis leads somewhere unexpected, we explain it in plain language before we touch another component. That's not a policy we invented. That's just how repair work should go. If your business is dealing with a system that's down right now, our emergency HVAC service runs around the clock.

When Commercial Repair Makes Sense Versus Replacement

Equipment age and repair cost together shape a replace-or-repair decision, but they don't settle it. A 12-year-old rooftop unit with a $300 contactor failure doesn't need to be replaced. A 15-year-old unit with a failed compressor and a history of refrigerant leaks is a different story. We'll tell you both numbers and let you decide. We don't benefit from selling you a new unit. Our technicians aren't compensated on equipment sales. If repair is the right call, we'll say so. If the math genuinely points toward replacement, we'll say that too, and we'll explain exactly why. You can also get a free HVAC second opinion if another contractor has already quoted you a replacement and something doesn't add up.

What to Expect When You Call Us for a Commercial Job

We give you a 2-hour arrival window, not a 6-hour block. You'll get a confirmation when the appointment is set, a reminder before the visit, and a text with technician information when we're on the way. For commercial jobs, that matters. You've got a business to run and can't spend half a day guessing when the van is going to show up. We work on small commercial buildings throughout the West Metro. Offices, retail spaces, restaurants, shops, light industrial. We're not a large commercial contractor chasing multi-building contracts. If you're a small business owner who needs a contractor that shows up, diagnoses the problem correctly, and gives you a straight answer on what it costs to fix it, that's exactly what we do. Pair your repair visit with a commercial HVAC maintenance plan and most of these failures don't catch you by surprise in the first place.

Fully Insured, Repair-First, No Pressure

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Three things that should be obvious from a commercial HVAC contractor but often aren't.

Fully Insured

Every commercial job we take is covered. You're not assuming liability risk by letting us work in your building. Full Time Heating & Cooling carries full insurance on all commercial work.

No Commission-Based Technicians

Our techs don't earn more money if they sell you equipment. That's a structural decision, not a slogan. When a technician has no financial stake in what you buy, the diagnosis is honest by default.

24/7 Emergency Response

Commercial HVAC failures don't schedule themselves for Tuesday morning. If your system goes down over a weekend or mid-January at 11pm, call (952) 847-3387. We answer.

Real Commercial Repairs From Around the Service Area

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A sample of actual commercial HVAC repair calls, each one diagnosed and fixed instead of defaulting to a full rooftop unit replacement.

Chaska: Failed Capacitor Shut Down a Rooftop AC

A commercial rooftop air conditioning unit in Chaska shut down after a failed capacitor kept the condenser fan from running. We diagnosed the failed part, replaced the capacitor, and tested the unit. The building's cooling came back without replacing the rooftop unit.

Delano: Compressor Replaced Instead of the Whole Rooftop Unit

A commercial rooftop HVAC unit in Delano needed a compressor repair. We replaced the compressor and brazed the refrigerant lines back into place to properly seal the circuit, letting the existing rooftop unit return to cooling instead of being replaced outright.

15-Year-Old Carrier Rooftop Unit: Leak Repaired, $17,000 Replacement Avoided

A 15-year-old Carrier rooftop HVAC unit had lost cooling. Inspection found a refrigerant leak caused by metal rubbing against metal, which had worn a thin spot until refrigerant escaped. We repaired the weak area and restored cooling, letting the customer avoid an approximately $17,000 rooftop unit replacement.
Customer Reviews

What Commercial Customers Say

5.0 · 200+ Google reviews Read all reviews

  • Tenant-occupied property

    On time, good value, recognized another issue on site and addressed it immediately vs. having a separate service call which kept tenant comfortable and equipment from not being damaged further. Very pleased.

    John W. Housecall Pro review · August 2025

  • Rooftop drainage repair · Chaska

    Jason is a true pro at his job, and has excellent people skills, I am happy to give him my business.

    Dan H. Google review · September 2026

  • Lennox furnace at a business · Long Lake

    Prompt, Professional, knowledgeable and reasonable! Would highly recommend. Repeat customer of Full Time Heating & Cooling the technicians are fantastic.

    Eric L. Google review · March 2025

Schedule a Commercial Service Call

If your commercial system is down or running wrong, call (952) 847-3387 for an honest diagnosis from a fully insured, repair-first HVAC contractor serving the West Metro.

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FAQ Common questions

Frequently Asked Questions

Answers below
What does commercial HVAC repair typically involve that residential work doesn't? +
Commercial systems often run packaged rooftop units, multi-zone control systems, economizers, and larger refrigerant circuits. Fault diagnosis requires reading commercial control boards and understanding how the building automation interacts with the equipment. Commercial equipment also runs longer daily hours, which accelerates wear on contactors, bearings, and compressors. The diagnostic approach is the same, but the equipment layer is more complex and parts lead times can be longer for less common commercial components.
How long does a commercial HVAC diagnostic take? +
Most diagnostics on a single rooftop unit or split system take 45 to 90 minutes. Multi-zone systems with control failures can take longer because tracing the actual fault through zone boards and actuators is methodical work. We don't cut the diagnostic short to get to a faster answer. A misdiagnosis on a commercial system costs more time and money than the extra 20 minutes it takes to find the real problem.
Can you work on commercial rooftop units from multiple manufacturers? +
Yes. We work on RTUs from most common commercial manufacturers. If a unit is obscure enough that parts availability is a real problem, we'll tell you upfront before starting the repair. The honest answer on some aged commercial equipment is that parts are on long lead times or simply discontinued, and that factors directly into whether repair or replacement makes better sense for your business.
What happens if a commercial system fails after hours or on a weekend? +
Call (952) 847-3387. Our emergency HVAC service runs 24 hours a day, every day, including weekends and holidays. A retail space losing heat on a Saturday or a restaurant's cooling system failing on a Friday night isn't a problem you can wait until Monday to address. We respond to commercial emergency calls the same way we respond to residential ones: urgently.
Do you offer commercial HVAC maintenance to prevent repeat failures? +
Yes. Most emergency commercial calls we go on have a maintenance history that explains the failure. Dirty coils, worn contactors, and neglected filters don't announce themselves, they just shorten the system's life and increase the chance of a shutdown at the worst possible moment. Our commercial HVAC maintenance program is designed to catch the small stuff before it becomes a business interruption.

Our promise

If we can repair it, we will.

No unnecessary replacements.We fix what's actually wrong and explain your options.

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Updated October 2026

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