Rooftop Package Units
Standard for retail, office, and restaurant spaces. Single cabinet handles heating and cooling with supply and return running through the roof deck. Efficient to service because everything is in one place.
Full Time Heating & Cooling · Watertown, MN
Commercial HVAC Installation for Small Businesses and Facilities
24/7 Emergency Service5.0 Rating · 200+ Google ReviewsMN Bonded #MB792165NATE-Certified Technicians
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Rooftop unit opened up with the heat exchanger pulled for replacement
What Commercial HVAC Installation Actually Involves
Commercial HVAC installation is not a scaled-up version of a home furnace swap. Code requirements differ, equipment is heavier and more complex to stage and position, and ventilation calculations have to account for occupancy loads and building use type. Full Time works through the job in a defined sequence: load calculation first, equipment selection second, installation third. We don't pick a unit and reverse-engineer the math to justify it. If your building already has ductwork, we assess its condition before recommending whether to reuse it, modify it, or replace sections. For spaces without ductwork -- warehouses, garages, additions -- makeup air handler services and ductless options both get evaluated based on the actual layout, not on which system costs more.
Systems We Install for Commercial and Light Industrial Spaces
Details below
The right equipment depends on how your building is built and what you're doing in it.
Rooftop Package Units
Split Systems for Commercial Use
Radiant and Gas Unit Heaters
Ductless Mini Split Systems
Ventilation and Makeup Air
Zoned Commercial Heating and Cooling
Control compartment of a commercial rooftop unit opened for diagnostics
Commercial Furnace Installation and Heating System Options
Commercial furnace installation covers more than a rooftop package unit. When the heating side is a standalone commercial furnace, a gas unit heater, or a boiler-fed system, the install starts with a heat-loss calculation for the actual building, not a square-foot shortcut. Full Time sizes the furnace to the occupied load, confirms the gas line and venting can carry it, and verifies combustion air before anything gets set. That sequence is the difference between a furnace that short-cycles and one that runs clean for 15 to 20 years.
Commercial heating system installation in the Twin Cities West Metro usually falls into one of a few setups, and the right one depends on how the space is used:
- Standalone commercial gas furnaces for office, retail, and restaurant spaces tied into existing or new ductwork
- Gas unit heaters and radiant tube heaters for warehouses, shops, and garages where heating the full air column wastes fuel
- Heating coils and air handlers paired with makeup air systems where ventilation code drives the design
- Zoned heating for multi-room facilities that run on different schedules
Repair-first still applies here. If your existing furnace or heat exchanger can be fixed and run reliably, we'll tell you that before we quote a new unit. We size and install heating only when the old system genuinely can't keep up. If you're weighing a replacement a contractor already recommended, bring it to us for a free second opinion, or call (952) 847-3387 to set up a site walkthrough.
Servicing rooftop cooling equipment on a mobile kitchen trailer
When Replacement Actually Makes Sense
Repair cost and system age both weigh on a commercial replacement decision, but neither settles it on its own. A 12-year-old rooftop unit that needs a $600 motor repair doesn't need to be replaced. A 10-year-old unit that needs a compressor and has a history of coil problems might. Full Time will tell you which situation you're in before you spend money on either path. Our technicians are not on commission, which means there's no financial reason for us to push you toward a new unit if the existing system can run reliably. If you're getting a second opinion on a replacement recommendation, we offer free HVAC second opinions -- bring the other company's assessment and we'll go through it with you.
Rooftop unit opened up with the heat exchanger pulled for replacement
What the Installation Process Looks Like
Before anything gets ordered, we walk the building. That visit covers the mechanical space, ductwork condition, electrical service, fuel source, and ventilation requirements. Equipment gets specified based on that walkthrough, not on a phone estimate. Once equipment is on-site, installation runs in a defined sequence: removal of the old system if applicable, new equipment placement and rigging, refrigerant line and electrical connections, ductwork modifications, commissioning, and a final walkthrough with you. On installation jobs, you're working with an established crew, not whoever was available that week. Jason stops by at completion of every installation to inspect the work before we consider the job closed. You'll get a thermostat walkthrough and confirmation that the system is performing to spec before we leave.
Installing a ductless mini-split condenser at a commercial property
Scheduling and Minimizing Downtime for Your Business
Commercial installations have a real operational cost when they require shutting down part of the building. We plan installation sequences with that in mind -- staging equipment delivery to avoid blocking loading areas, scheduling disconnection of existing systems at low-traffic hours when possible, and committing to a realistic timeline before we start. You'll get a two-hour arrival window confirmed before the crew shows up, plus a text when they're on the way. For facilities that need heating or cooling running at all times, we discuss interim options before the job starts, not after the old system is already out. If a heating emergency comes up before or during a planned installation, emergency heating repair is available 24/7.
Control compartment of a commercial rooftop unit opened for diagnostics
AirQuest Commercial Equipment: The Honest Case for It
AirQuest isn't the most recognized name in commercial HVAC. It's a Carrier-built product line, manufactured on the same lines, meeting the same specifications, at a price point that doesn't include a premium for brand recognition. For light commercial applications -- retail, office, small industrial -- the performance and reliability track record is solid. As an AirQuest Elite Dealer, Full Time qualifies installations for two additional years of No Hassle Replacement coverage beyond the manufacturer warranty on qualifying equipment. That's real coverage on a significant capital expense. If you've been quoted a different brand and want to compare, we'll give you an honest side-by-side. We're not going to tell you AirQuest is the only option if your situation calls for something else. Check our about us page for more on how we make equipment recommendations.
What Commercial Customers Say
5.0 · 200+ Google reviews
Read all reviews
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New furnace and AC for a business · Victoria
Jason and his team are simply the best. Prompt service, helpful recommendations, and top tier customer service. From general maintenance to brand new installation you cannot beat Full Time Heating & Cooling.
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Business HVAC service · Spring Park
Very responsive and fast service!
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Commercial HVAC · Plymouth
Jason always provides Excellent, Honest, Quality Service!
Ready to Plan a Commercial HVAC Installation?
Call or text (952) 847-3387 to schedule a site walkthrough. We'll assess your building, give you honest equipment options, and put together an accurate installation plan before you commit to anything.
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FAQ Common questions
Frequently Asked Questions
Answers below
What does commercial furnace installation cost and what does it involve? +
Commercial furnace installation cost depends on the heating load, the furnace type (standalone gas furnace, gas unit heater, or a heating coil tied into a larger commercial HVAC system installation), the condition of existing ductwork and gas supply, and venting and combustion-air requirements. A single furnace in a small retail or office space is a different job than a multi-zone warehouse heating setup. We don't quote heating installs over the phone because the scope varies too much to be accurate. Full Time runs a heat-loss calculation, checks the gas line, venting, and electrical, and gives you a specific number after the walkthrough. If your current furnace can still be repaired reliably, we'll tell you that first.
How long does a commercial HVAC installation take? +
Most light commercial installations -- a single rooftop unit or split system in a retail or office space -- run one to two days from equipment delivery to commissioning. Larger projects involving multiple zones or makeup air systems take longer. We give you a specific timeline after the building walkthrough, not a generic estimate over the phone, because the actual scope varies too much to guess accurately.
What size HVAC system does a commercial building need? +
Commercial load calculations account for square footage, ceiling height, insulation, window area, occupancy, and internal heat loads from equipment and lighting. A rough residential rule like 'one ton per 400 square feet' doesn't hold in commercial applications. A restaurant kitchen, a server room, and a retail floor of the same size need completely different systems. We run the calculation before specifying equipment -- it's the only way to avoid an oversized system that short-cycles or an undersized one that can't keep up.
What warranty comes with a commercial AirQuest installation through Full Time? +
AirQuest equipment includes manufacturer limited warranties that vary by model -- many qualify for a 10-year parts limited warranty with timely registration. Qualifying products also include a No Hassle Replacement Limited Warranty. As an AirQuest Elite Dealer, Full Time provides two additional years of No Hassle Replacement coverage on qualifying installations. We confirm warranty eligibility and handle registration on every job.
Can commercial HVAC be installed without shutting down the business? +
Sometimes, depending on the scope and building layout. Ductless systems in isolated zones can often be installed without touching the main system. Rooftop replacements typically require a shutdown window for the affected area. We plan the installation sequence with your operations in mind and discuss the downtime picture before anything gets ordered -- not after the old equipment is already disconnected.
What is the difference between commercial and residential HVAC installation? +
Commercial HVAC involves heavier equipment, more complex electrical and refrigerant requirements, stricter ventilation codes, and load calculations that account for occupancy and equipment heat loads rather than just square footage. Commercial systems also handle zoning, makeup air, and exhaust integration that most residential jobs don't require. The installation crew needs experience with rooftop staging, larger refrigerant charges, and commercial controls -- it's a different skillset than residential work.
Does Full Time install radiant or gas unit heaters for warehouses? +
Yes. Warehouses and shops are poor candidates for forced-air systems because heat rises and the occupied zone stays cold while the ceiling zone stays warm. Gas unit heaters and radiant systems direct heat at the occupied level, which means faster comfort and lower fuel consumption than trying to heat the full air volume. We assess the building dimensions, ceiling height, and use before recommending which approach fits the space.
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
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