Open 24/7 for emergencies
Heating, air conditioning and kitchen refrigeration for Northern Virginia churches, done on weekdays and planned around your services.
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5.0 stars across 1,130 reviews
Efrain and two of the crew fitting the curb for a new rooftop unit on a church roof in Chantilly, August 2026.
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
The Sunday problem
Every person in a pew gives off about 330 Btu of heat an hour. That’s ASHRAE’s figure for a seated audience, and about a third of it is moisture from breathing. Three hundred people is 99,000 Btu an hour: a little over 8 tons of air conditioning, spoken for before the sun hits the roof or anyone turns the lights on.
So a system that holds 72 in an empty sanctuary on Saturday can lose the room by the sermon. The fixes aren’t glamorous. Start cooling hours earlier on hot Sundays, keep the coils clean so the unit makes its full capacity, and make sure it’s pulling water out of the air, not just making it cold. A room can read 74 and still feel sticky.
Seated-audience heat gain per ASHRAE. One ton of air conditioning removes 12,000 Btu an hour.
A sanctuary that’s full for a few hours on Sunday doesn’t need 72 degrees the rest of the week. ENERGY STAR’s action workbook for congregations puts it plainly: install a programmable thermostat to control the HVAC system. We set each zone to your real calendar, services, choir practice, Wednesday nights, and lock the ones people like to adjust. With a smart thermostat, the office can add a Tuesday funeral from a phone.
Heating a building that’s empty six days a week, the long version
| Day | Occupied, 72° | Warming up | Added from the office |
|---|---|---|---|
| Mon | Set back | ||
| Tue | Set back | 10am to 1pm | |
| Wed | 6:30pm to 9pm | 5:30pm to 6:30pm | |
| Thu | 7pm to 9pm | 6pm to 7pm | |
| Fri | Set back | ||
| Sat | Set back | ||
| Sun | 8am to 1pm | 5:30am to 8am |
Church heating
Most church rooftop units heat with gas. The flame burns inside a metal box called a heat exchanger, and the air you blow into the sanctuary passes over the outside of it. When that metal cracks or rusts through, combustion gas can get into the air stream. That’s how carbon monoxide ends up in a full room.
So every fall we look at every heat exchanger before the heating season starts. When one has failed, we shut the gas off, tag the unit, and tell you that day, with the photos. It’s not rare. Two of the church jobs further down this page started exactly that way.
Put a carbon monoxide alarm in each room those units serve, too. It’s the backstop between our visits.
How to know a cracked heat exchanger diagnosis is real
Leave this tag on the unit.
One of our vans, with our Virginia Class A license number on the side panel above the wheel.
What’s on your roof
One building often holds four generations of equipment, each bought by whichever committee had the budget that year. We work on all of it.
Serves: Sanctuary, fellowship hall, education wing
We do: Service, repair and replacement of packaged gas and electric rooftop units, from small units to 50 tons. When the new unit doesn’t fit the old roof opening, a curb adapter or a new curb, and we bring the crane. Across Fairfax County, Loudoun and Prince William.
Serves: Offices, classrooms, nursery, parish hall
We do: Condensers, air handlers and heat pumps, from a single office system up to a 20-ton commercial split.
Serves: Classroom wings and older additions
We do: Inspections, inducer motors, ignition and flame sensors, condensate pumps, and the heat exchanger check every fall.
Serves: Rooms the ductwork never reached
We do: Mitsubishi Electric VRF and ductless systems: a choir room, an office over the narthex, a new addition.
Serves: Every zone in the building
We do: Programmable and smart thermostats, zone sensors, economizers, and the duct smoke detectors that tie the rooftop units to your fire alarm.
The fall rooftop unit inspection, and when to stop repairing
A new rooftop unit coming up by crane onto a church in Chantilly, August 2026. That’s Efrain on the roof, watching it in.
Church refrigeration
A fellowship hall kitchen and a food pantry run on the same rule as a restaurant: cold food stays at 41°F or colder. That’s the FDA Food Code’s line. When a walk-in cooler or a reach-in freezer starts drifting on a Saturday, it’s the week’s donations on the line, and nobody’s in the building to notice.
We repair walk-in coolers and freezers, reach-in coolers and freezers, and ice machines, and we put them on the same maintenance visit as the rest of the building so the condenser coil gets cleaned before summer, not after it quits.
| When | Temp | Check |
|---|---|---|
| Fri 4:00 pm | 38°F | OK |
| Sat 9:00 am | 40°F | OK |
| Sat 6:00 pm | 45°F | High |
| Sun 7:00 am | 52°F | Call |
Hold at 41°F or below. An example log. The FDA Food Code holds cold food at 41°F or below.
The work, not the names
These are Northern Virginia congregations we look after. We’ve left their names off, because they’re our customers, not our advertising. The equipment and what we found are as written on the work orders.
Trane 20-ton rooftop unit, plus a 12.5-ton unit
Found: One of more than twenty rooftop units on the campus, due for replacement, and a multipurpose room that needed its own unit. Did: Replaced it with a Trane 20-ton unit, and set a 12.5-ton unit with an economizer and Humiditrol humidity control over the multipurpose room. Both by crane.
Six rooftop units
Found: In January, a heat exchanger with a hole in it. Two more failed the same check when we inspected all six in March. Did: Shut the gas off that day. A new Trane 20-ton unit went up in February; the other two were replaced on new curbs in August.
Trane 20-ton commercial split, furnaces, a kitchen freezer
Found: Aging units through a summer heatwave, then a system that needed replacing. Did: Kept them running through the heat, installed a Trane 20-ton split with a crane, and now do the fall furnace inspections and the kitchen reach-in freezer too.
Lennox 12.5-ton rooftop unit
Found: A cracked heat exchanger on one of eight rooftop units. Did: Replaced it by crane on a curb adapter, so the new unit fit the old roof opening.
Rooftop units, including a 1995 Trane on R-22
Found: Maintenance that hadn’t been done in years, a failed induced draft motor and a bad zone sensor. Did: Fixed both, serviced the rooftop units and split systems, and installed new Honeywell thermostats.
Duct smoke detectors; a Mitsubishi VRF system
Found: At one church, failed duct smoke detectors holding the fire alarm in trouble. At another, a seven-head VRF system down on a blown main fuse. Did: Replaced the detectors and cleared the alarm; found the fault and brought the VRF system back.
The system we put in first
Built to take a beating. Put in by our crew.
Heat lamps, snow and rain on one outdoor unit: that’s Trane’s own film. We’re a Trane Comfort Specialist, on Trane’s own dealer locator, and when you pick a Trane, our crew puts it in.
Films: Trane’s own.
From the people who called us
During an intense heatwave, Moises provided exceptional emergency service for our aging commercial HVAC units at the church, ensuring they kept running through the hottest days of summer. Their prompt response, expert repairs, dedication to quality, and fair pricing were truly impressive. For reliable and top-tier HVAC services, Moises is a standout choice. I highly recommend Tyler, Moises, and the entire team at SwiftPro for all your commercial or residential HVAC needs!
Church HVAC, through a summer heatwave
I highly recommend Moises Rojas from SwiftPro for HVAC repairs. He was prompt, professional, honest, and quickly diagnosed and fixed the issue without any upselling. His workmanship was excellent. If you need reliable and trustworthy HVAC service, Moises is the best choice.
Church HVAC repair
Tyler is beyond knowledgeable and professional! He’s done HVAC work for our church and others we know. So he’s the obvious choice to consider for our home! Explained various options with pros and cons to find the right system for us!
Church HVAC, then her home
Two of these name Moises Rojas. One names Tyler, who owns the company.
How it goes
Tell us about the building, roughly how many units, and when you meet. If you know who installed what, great. If not, that’s normal.
On a weekday, while the building’s quiet: the roof, the mechanical room, the classrooms and the kitchen.
A written estimate with options and prices before any work starts, plain enough to hand to the trustees or the building committee.
Repairs on weekdays. Replacements and crane days planned with you, clear of Sundays, weddings, funerals, Christmas and Easter.
Spring for the cooling, fall for the heat. Every visit ends with a dated record of each unit: what we found, what we did, what’s coming due.
The rest of the building
We’re a heating, cooling and plumbing company, with a dedicated team for each. So one call covers more of the building than the rooftop units.
Tyler, who owns SwiftPro, with the vans in Chantilly.
Questions
Yes. Maintenance and most repairs happen on weekdays, when the building’s empty. Replacements, and anything that needs a crane, get scheduled with you, away from Sundays and your big services. If something quits on a Saturday night, call (703) 997-9757 and we’ll tell you straight when we can be there.
Yes, and in Loudoun, Prince William and Arlington. We service, repair and replace packaged rooftop units, including the big ones over a sanctuary. When the new unit doesn’t match the old roof curb, we use a curb adapter or set a new curb, and we bring the crane.
Because the people are the biggest heat source in the room. A seated adult gives off about 330 Btu an hour, so 300 people use up a little over 8 tons of cooling on their own. Starting the system earlier, clean coils and a unit that actually dehumidifies fix most of it. If it still can’t keep up, we’ll measure and tell you whether the equipment is too small for the room.
Twice a year: spring before the cooling season, fall before the heat. ENERGY STAR’s workbook for congregations says the same thing in its own words: clean the heating and cooling coils twice a year, change filters monthly in the busy seasons, and keep the system on an annual maintenance contract.
Yes. Every estimate is in writing, with options and prices, before any work starts. Repair or replace, one unit now and two next year: you’ll see each option priced so the committee can decide on its own schedule.
Almost always because the heat exchanger failed, which can let carbon monoxide into the air going to the room. We’ll show you photos of what we found, and you’re welcome to have someone else confirm it before you replace anything. A real crack holds up to a second look.
Yes: walk-in coolers and freezers, reach-ins and ice machines. If the pantry depends on one, put it on the same maintenance visit as your HVAC so its coil gets cleaned before the summer.
Yes. Most of what we do every day is homes, so the pastor’s house, the rectory or the parsonage is ordinary work for us: heating, air conditioning, plumbing and water heaters.
It depends on the unit, and we’ll tell you which and why. We still keep a 1995 rooftop unit running for one church. A failed heat exchanger, a compressor on an old refrigerant, or repairs that keep stacking up are what usually tip it to replacement.
Northern Virginia churches
Call or text, or book a walkthrough online. Tell us it’s a church and roughly how many units, and we’ll set up a weekday visit.
SwiftPro Heating, Cooling & Plumbing
4230 Lafayette Center Dr N, Chantilly, VA 20151
44679 Endicott Dr, Suite 211, Ashburn, VA 20147
Virginia Class A contractor license #2705192276
Virginia Class A contractor license #2705192276. BBB Accredited with an A rating.
Serving churches in Fairfax County, Loudoun County, Prince William County, Arlington, Alexandria, Falls Church and Manassas.