Open 24/7 for emergencies
The diagnostic visit is $99, and a run capacitor replaced is $240 to $370 from our published price book.
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AC and heat pump repair in Dumfries, inside the Town and out in Montclair and Southbridge, priced from our book before a panel comes off.
5.0 stars across 1,132 reviews
One of our HVAC technicians beside an outdoor unit at a Northern Virginia home, the vans at the curb.
Licensed and insuredVirginia Class A contractor #2705192276
24/7 emergency serviceOften same-day, 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
What it costs
The same price book as our AC repair page. The diagnostic visit is $99, and the common parts ride on the truck, so most of these get fixed on the first visit.
Run capacitor replaced
$240 to $370
Contactor replaced
$290 to $425
Condensate drain cleared
$175 to $420
Refrigerant topped up
$190 to $740
Blower wheel pulled and cleaned
$300 to $440
Refrigerant leak found and repaired
$1,850 to $2,700
or $31/mo at 0% APR for 60 months
Repair diagnostic visit
$99
Monthly figures: 60mo @ 0% APR on each starting price, the whole price financed, on approved credit. Longer plans lower the payment and cost more in total. The lender sets the final terms. How financing works
Often same-day, and we will tell you honestly when we can get there.
With Comfort+ membership, $20 a month or $199 a year, the diagnostic visit is included, any service is 15% off, and the cooling and heating maintenance visits are part of the membership.
What’s different in Dumfries
About half the owners inside the Town of Dumfries heat with electricity, and in a Dumfries house that usually means the unit out back is a heat pump. It cools in July and heats in January, so a repair on one should end with a test run in heat mode as well as cooling. The 1980s were the Town’s busiest building decade, about three homes in ten, which puts a lot of these on their third outdoor unit.
The townhouse rows set the pattern. Town records date Williamstown, the largest at about 455 homes, to 1974 through 1991, Port O’Dumfries to 1974 through 1988, and South Cove to 1988 through 1992. In those rows the air handler usually lives in a closet or the attic, and the condensers line up behind the units, where a privacy fence or a deck built too close can choke the air a condenser needs to shed its heat.
Past the town line it changes by neighborhood. Montclair, three houses in four single-family with a median built in 1989, leans electric just like the Town, so heat pumps again. Cherry Hill, the Census place covering most of 22026 outside the Town, is newer, its median owner home built in 2005, and about seven owners in ten burn gas. There it’s a furnace inside and a separate air conditioner out back sharing one blower, and the first ones are reaching the age when coils and compressors start to leak.
A repair needs nothing from anybody. A replacement does, and the office follows the town line. Inside it, the Town of Dumfries runs its own building department, and its mechanical permit application has a line for AC equipment replacement, indoor, outdoor or both. In the Town’s historic district, the Town Code holds building permits until a certificate of appropriateness is approved, which matters when a new condenser goes in a new spot. Outside the line, Prince William County handles it.
Neighborhood by neighborhood
Census figures for each place, and what that usually means for the air conditioning. Median year built and heat count owner-occupied homes only.
| Place | Median home built | Most homes are | Heated with | What the cooling usually is |
|---|---|---|---|---|
| Montclair | 1989 | single-family houses, about 8 in 10 | electricity, about 5 in 10 | Mostly electric heat: heat pumps that cool in summer and heat in winter. |
| Cherry Hill | 2005 | townhouses, about 4 in 10 | gas, about 7 in 10 | Townhouse streets: condensers side by side, air handler in a closet or attic. |
| Dumfries | 1985 | townhouses, about 4 in 10 | electricity, about 5 in 10 | Mostly electric heat: heat pumps that cool in summer and heat in winter. |
By the numbers
From the Census Bureau’s 2020 to 2024 survey. Median year built and heat count owner-occupied homes only.
Nearly all of the Town sits in 22026, with a sliver in Triangle’s 22172. None of it is in 22025.
Montclair in 22025, where the Postal Service accepts Montclair as the town name; Southbridge and Cherry Hill in 22026, outside the town line.
ZIPs 22025 and 22026 as a whole: Montclair, Cherry Hill and the rest of Dumfries mail, the Town’s homes included.
What you’d notice
Parts of Dumfries are low, flat ground by the water, and the Town’s floodplain manager in Public Works can tell you whether your parcel is in FEMA’s special flood hazard area. If storm water rose over the outdoor unit, leave the breaker off until a tech has checked the wiring, the contactor and the fan motor. Starting a wet condenser can turn a repair into a replacement.
Ice on the outdoor lines in July means low refrigerant or starved airflow. Shut it off to thaw and call; running it iced can take out the compressor.
Usually the outdoor unit has stopped running. A hum with no fan turning is almost always the run capacitor; silence while the thermostat calls is usually the contactor.
Choosing who fixes it
Questions worth asking anybody who comes out, us included.
A Dumfries mailing address won’t tell you, and the Town says as much itself. It matters the day a repair turns into a replacement: inside the town the paperwork goes to Town Hall, outside it to Prince William County. A tech who asks up front won’t send it to the wrong office.
A company that prints what a capacitor or a contactor costs has already told you the number. One that won’t say until the tech is in your driveway hasn’t.
A healthy system drops the air somewhere around 16 to 22 degrees across the indoor coil. Low refrigerant means a leak, and topping it up every summer is the expensive way to find that out.
Some repairs aren’t worth doing on a 20-year-old system. The good answer shows you the repair price and the replacement price side by side and lets you pick.
Two of our crew going over a work order before the day's calls.
From our Google reviews
5.0 stars across 1,132 reviews. Read them on our reviews page.
Elvis did excellent work repairing my heater and air conditioner. I couldn’t be happier!
Where we work
Next door to Dumfries: Triangle, Quantico, Woodbridge, Lorton and Stafford.
Questions
Yes. Montclair is in 22025 and Southbridge in 22026, and the Postal Service accepts both names, but both sit in Prince William County, not the Town. Same techs, same price book, and the diagnostic visit is $99.
No. A run capacitor at $240 to $370 or a cleared condensate drain at $175 to $420 is a repair, and repairs take no permit. Swapping the equipment is different: the Town’s mechanical permit has lines for an indoor unit, an outdoor unit or both, filed at Town Hall with a copy of the contractor’s state license.
The diagnostic visit is $99. The common repairs: a run capacitor $240 to $370, a contactor $290 to $425, a condensate drain cleared $175 to $420, refrigerant topped up $190 to $740. A refrigerant leak repair runs $1,850 to $2,700.
Fix the cheap parts on almost anything. Think twice about a big repair on a system over 15 years old, and about any leak on an R-22 system. The HVAC estimator prices a new system in about a minute, so you can put the two numbers side by side.
Ready when you are
Call, or send the form at the top. The tech prices the repair from the book before starting, and if it’s the end of the road you’ll hear that first.
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
SwiftPro Heating, Cooling & Plumbing is a licensed, BBB Accredited (A rating), independently owned heating, cooling and plumbing company in Chantilly, serving Dumfries and the rest of Northern Virginia. Virginia contractor license #2705192276. 5.0 stars across 1,132 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.