Full Time Heating & Cooling · Watertown, MN
Commercial Rooftop HVAC Unit Service, Available Around the Clock
24/7 Emergency Service5.0 Rating · 200+ Google ReviewsMN Bonded #MB792165NATE-Certified Technicians
NEED HVAC SERVICE?Leave your number. We'll call within one business day.
We'll call within one business day. No obligation. Your information stays private.
Commercial rooftop condenser being serviced with gauges and nitrogen
What Rooftop HVAC Service Actually Covers
RTU diagnostics isn't filter swaps and calling it done. A proper service visit covers the full system: refrigerant charge and leak check, capacitor and contactor condition, economizer operation, drain pan and coil cleanliness, heat exchanger inspection on gas units, belt and blower condition, electrical connections, and thermostat calibration. We document what we find and explain it in plain language -- no upsell pressure, no replacing parts that don't need replacing. If your system runs Daikin rooftop package units or similar commercial equipment, we have the diagnostic tools and component knowledge to work on it properly. We also service boilers and heat pumps for facilities running mixed commercial systems.
RTU Preventative Maintenance: What You Get and Why It Matters
Details below
Skipping annual RTU maintenance doesn't save money. It defers costs into a more expensive failure at a worse time. Here's what a Full Time preventative maintenance visit covers on a commercial rooftop unit:
Electrical Inspection
Coil Cleaning
Economizer Function Test
Drain Pan and Line Inspection
Blower and Belt Condition
Signs Your RTU Needs Attention Now
Commercial rooftop units don't always fail all at once. More often, they degrade gradually until the damage is expensive. Watch for these signals:
Servicing rooftop cooling equipment on a mobile kitchen trailer
How We Handle Commercial RTU Service Calls
When you call Full Time Heating & Cooling for a rooftop unit, you'll get a confirmed arrival window -- not a vague 'sometime this afternoon.' We show up with the diagnostic equipment to read fault codes, measure electrical draw, and test refrigerant charge on the unit. We don't guess. If we find something that needs repair, we tell you what it is and what it'll take before we touch it. If a repair makes sense, we do it. If the system is at a point where repair isn't the right call -- we'll tell you that too, and walk you through what rooftop unit replacement looks like. For facilities also managing makeup air handlers or air exchangers, we can assess those systems on the same visit.
Rooftop view of three Bryant commercial HVAC packaged units with a technician working near one of them
Repair or Replace on a Rooftop Unit
Repair or replace on an RTU comes down to the unit's age, the repair estimate, and its service history. On a 4-year-old unit with a $500 repair, repair is clearly the right call. On a 12-year-old unit with a history of the same failure, replacement starts to make sense. We apply this kind of reasoning on every service call -- because our technicians aren't paid to sell you new equipment. They're paid to give you an accurate diagnosis. If repair makes sense, we'll say so. If it doesn't, we'll tell you why and give you honest guidance on replacement options. Check our ways to save page if you're evaluating costs on a commercial system.
What Rooftop Unit Customers Say
5.0 · 200+ Google reviews
Read all reviews
-
Rooftop maintenance · Chanhassen
Jason and his team, did routine maintenance on our air conditioning units. Then put new belts on some of our air moving equipment. He found that one of our electric motors was seized and ordered a new one. That will go in soon. Great service!
-
Rooftop units, commercial office
Jason, does an excellent job on my multiple roof top units on my commercial office space . Efficient, affordable and always on time!
-
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.
Ready to Schedule RTU Service?
Full Time Heating & Cooling is available 24/7 for commercial rooftop HVAC emergencies and can schedule routine RTU maintenance during the week. Call or text (952) 847-3387 or use our contact page to set up a service call. We'll confirm your appointment window, send a technician who's been briefed on your system type, and give you a straight answer on what we find.
Or send us your info
FAQ Common questions
Frequently Asked Questions
Answers below
What exactly does a rooftop package unit (RTU) contain, and what makes servicing it different from a split system? +
An RTU houses the compressor, condenser coil, evaporator coil, and air handler all in one cabinet mounted on the roof. That means every refrigerant-side and airside component is in a single accessible location, which simplifies some repairs -- but roof access, weather exposure, and the size of commercial units add complexity a split system doesn't have. RTU diagnostics also require reading manufacturer fault codes and often testing economizer controls that residential systems don't include.
How often should a commercial rooftop unit be serviced? +
Most commercial RTUs should receive preventative maintenance twice a year -- once before the cooling season and once before heating season. High-demand facilities with extended operating hours, or units in dusty or corrosive environments, may need quarterly visits. Skipping annual maintenance voids manufacturer warranty coverage on many units and accelerates component wear, particularly on contactors, capacitors, and compressor valves.
Can Daikin rooftop package units be serviced by any HVAC contractor, or do they require a brand-specific technician? +
Daikin rooftop package units can be serviced by any qualified commercial HVAC technician with proper refrigerant handling certification and access to diagnostic tools that read Daikin fault codes. You don't need a factory-authorized Daikin technician for most service and maintenance work. Where brand-specific authorization matters is warranty claims -- if your unit is under active manufacturer warranty, verify your service provider's qualifications before authorizing repair work.
What are the most common rooftop HVAC unit failures on commercial buildings in Minnesota? +
In Minnesota's climate, the most common RTU failures are: heat exchanger cracks from thermal cycling during extreme cold, refrigerant leaks accelerated by vibration on rooftop installations, economizer actuator failures from freeze-thaw cycles, and contactor failure from the heavy electrical load during summer cooling peaks. Drain pan freeze-up in late-season cooling is also common on units that run into October -- blocked drains cause water backup into the unit and can damage the electrical compartment.
What is HVAC, and does Full Time Heating & Cooling handle both commercial and residential systems? +
HVAC stands for Heating, Ventilation, and Air Conditioning -- the systems that control temperature, humidity, and air movement in a building. Full Time Heating & Cooling handles both residential and commercial HVAC, including rooftop package units, split systems, boilers, and heat pumps. Commercial rooftop service is a distinct skill set from residential work -- different equipment scales, different controls, and different failure patterns. We work on both.
Our promise
If we can repair it, we will.
No unnecessary replacements.We fix what's actually wrong and explain your options.
Keep Reading
Updated October 2026
More Services
- AC InstallationNew central AC installation from an AirQuest Elite Dealer. Your installation includes an owner inspection at completion. Call (952) 847-3387 for a straight answer.
- AC ReplacementWhat a new AC unit costs depends on size and system type. No-commission techs, AirQuest Elite Dealer warranty. Call (952) 847-3387.
- Air Conditioner MaintenanceAC maintenance that keeps your system running at full efficiency all summer. Honest diagnostics, no-commission techs. Call Full Time: (952) 847-3387.
- Air Conditioner RepairAC not cooling? We diagnose it first — no pressure to replace. Fully insured, 24/7 emergency service. Call Full Time Heating & Cooling for an honest repair estimate.
- Air ExchangerAir exchanger repair, cleaning, and installation from fully insured HVAC techs. No commission pressure. Call Full Time Heating & Cooling anytime.
- Air FiltrationDirty filter or stale indoor air? Full Time diagnoses your filtration setup and recommends only what your home actually needs. Fully insured. Call anytime.