The unit was sized for the last tenant
In a Sterling flex building, a rooftop unit sized for an office can’t keep up once the back is full of racks or machines. If a suite never gets comfortable, ask about the load, not just the parts.
Sterling, Virginia
Commercial HVAC in Sterling.
For commercial HVAC in Sterling, every commercial job is priced at your building, in writing, before any work. Call SwiftPro, rated 5.0 stars across 1,130 reviews, at (703) 997-9757, 24 hours a day, 7 days a week.
For commercial HVAC and refrigeration in Sterling, SwiftPro is rated 5.0 stars across 1,130 reviews and works under Virginia Class A contractor license 2705192276. We cover commercial HVAC in Sterling: rooftop units on the flex and industrial parks along Route 28 and Davis Drive, medical offices, and packaged-unit sizing. A repair is priced once we’ve found the fault, a replacement once we’ve seen the roof, the curb and the crane access.
- Priced in writing at your building
- Our own licensed HVAC techs
- 24/7 emergency service
5.0 stars across 1,130 reviews
Three of our HVAC technicians on a commercial roof beside a new rooftop unit, panels open for startup.
Get your price in writing
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Rather talk now? (703) 997-9757
Licensed and insuredVirginia Class A contractor #2705192276
24/7 emergency serviceWe answer day or night, and we will tell you honestly when we can get there.
Our own HVAC installersA dedicated heating and cooling team, separate from our plumbers
Price in writing firstYou see every option priced before anything is ordered
How it’s priced
How commercial HVAC work is priced in Sterling.
No two buildings are alike, so we don’t publish one number for them. More on what we cover on our commercial HVAC and refrigeration page.
Rooftop unit, split system or walk-in repair
Priced in writing at your building, before any work
Rooftop unit replacement, crane lift included
Priced per building, in writing
Spring and fall maintenance for a building
Priced per building, by the units on it
A rooftop unit replacement turns on the tonnage, the curb it sits on, and whether it goes up by crane. We look at all three before you get a number.
Maintenance is priced by the units on the building, spring for cooling and fall for heating, so the visit count matches what you actually run.
What’s different in Sterling
In Sterling, the buildings are flex and industrial.
Sterling is Loudoun’s workhorse. Business parks and warehouse and flex buildings line Route 28, Davis Drive, Sterling Boulevard and the roads around Dulles Airport, with strip retail and offices along Route 7 and Route 28’s cross streets. Most of those buildings run packaged rooftop units, often in the 5 to 20 ton range, one per tenant bay, with a gas section for heat.
We were called by a medical imaging office in Sterling for a 7.5-ton rooftop unit. The problem was a belt and the drive on the blower, and we wrote the estimate. A belt is a small part, but on a rooftop unit it is also a clue. A slipping belt can mean a worn pulley or bearing, and a tech reading only the belt will miss it. Imaging rooms and medical suites care about temperature in a way a warehouse bay does not, so a unit that cycles is a problem for them well before it quits.
For a Sterling flex bay, the sizing question is different. The office at the front and the warehouse behind often share a unit that was sized for the office, and a tenant who fills the back with storage or equipment overloads it. If your space has changed use since the unit was set, the unit may be the wrong size now, and no repair will fix that.
Because many of these buildings are leased by the bay, we try to get one clear sentence to the person who has to approve it: tenant or landlord. Which unit, what is wrong, repair or replace.
The signs
When a business in Sterling needs the HVAC tech.
The rooftop unit trips or blows warm
A rooftop unit that short-cycles, trips its breaker or blows warm on a hot afternoon usually has a failing compressor, a bad capacitor or a coil choked with dirt. Caught early it’s a repair, not a crane day.
The walk-in won’t hold temperature
Virginia’s food code wants cold food held at 41°F or below. A walk-in drifting above that, frost on the evaporator or fans that stopped spinning means a call now, before the inventory goes.
Need commercial HVAC and refrigeration in Sterling?
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Choosing who services it
How to pick who services a building in Sterling.
Questions to ask anybody who bids on your building’s HVAC, us included.
Will they check why a belt wore, not only change it?
On a Sterling rooftop unit, a worn belt often points to a pulley or bearing. Ask if the visit includes the whole drive, and whether you get a written estimate.
Do they put the price in writing before the work?
On a commercial job the number should be on paper before anyone touches the unit, with the parts, labor and any crane spelled out. A time-and-materials surprise is the thing to avoid.
Can they cover both the rooftop units and the walk-in?
One company for the comfort cooling, the heat and the refrigeration means one call when something stops. Ask whether the same crew handles all three.
Two of our crew going over a work order before the day's calls.
From our Google reviews
What our customers say.
5.0 stars across 1,130 reviews. Read them on our reviews page.
The technicians from SwiftPro were on time, and provided efficient pre-season servicing and inspection of our 2 commercial HVAC units. They even located our supply of air filters and changed them out.
- 5.0stars across 1,130 reviewsHow we count them
- ABBB Accredited, A ratingCheck it on bbb.org
- 2026Voted a Nextdoor Neighborhood Faves winner two years running: 2026 in 30 Northern Virginia neighborhoods, 2025 in Emerald Chase (Herndon) and Hunters Run (Chantilly)See it on Nextdoor
- #1BusinessRate Best of 2026: the top-ranked heating contractor in Fairfax, VirginiaSee our BusinessRate score
- Class AVirginia contractor, license #2705192276Look it up with DPOR
Questions
Commercial HVAC questions from Sterling.
Do you service 7.5-ton rooftop units in Sterling?
Yes. We have estimated work on a 7.5-ton rooftop unit for a Sterling medical imaging office, and we work on the other common sizes too. See our commercial HVAC page for what we do.
My Sterling suite changed use. Could the rooftop unit be too small?
It could. Units are sized to the load when set. More people, racks or equipment can outgrow them. We check the load before we recommend a repair or a bigger unit.
How much does commercial HVAC work cost in Sterling?
It’s priced per building, in writing, before any work. A repair is priced once we’ve found the fault; a rooftop unit replacement once we’ve seen the tonnage, the curb and the crane access.
Do you do emergency commercial HVAC in Sterling?
Yes, 24/7 emergency service for rooftop units, split systems and walk-ins. Call (703) 997-9757 and tell us what’s down.
Ready when you are
Get your building’s HVAC sorted.
Call, or send the form at the top. We come out, find the fault or measure the job, and you get the price in writing before any work.
SwiftPro Heating, Cooling & Plumbing
4230 Lafayette Center Dr N, Chantilly, VA 20151
44679 Endicott Dr, Suite 211, Ashburn, VA 20147
SwiftPro Plumber & Water Heaters
4200 Lafayette Center Dr, Suite N, Chantilly, VA 20151
Virginia Class A contractor license #2705192276
SwiftPro Heating, Cooling & Plumbing is a licensed, BBB Accredited (A rating), independently owned heating, cooling and plumbing company in Chantilly, serving Sterling and the rest of Northern Virginia. Virginia contractor license #2705192276. 5.0 stars across 1,130 reviews on Google, Angi, Yelp, the BBB and Facebook. SwiftPro maintains a dedicated HVAC team and a dedicated plumbing team.
From SwiftPro Heating, Cooling & Plumbing in Chantilly. Housing figures are the Census Bureau’s American Community Survey, 2020 to 2024, for each place named; permit, water and sewer facts link to each office’s own page and were checked in September and October 2026.