Open 24/7 for emergencies
For a Dumfries house keeping its furnace, AC replacement is $5,942 to $14,450 installed. The town line picks the permit office.
Price range
$5,942-$14,450
8yrs @ 7.99%
$84/mo
15yrs @ 9.99%
$64/mo
Monthly figures on the starting price, the whole price financed, on approved credit. The lender sets the final terms. How financing works
Get your price in writing
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5.0 stars across 1,131 reviews
One of our HVAC technicians moving a new condenser up a driveway, the van behind him.
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 our estimator runs on, for a central air conditioner on its own, keeping the furnace you have. A single-stage unit on a small house sits near the bottom; a variable-speed one on a big house, near the top.
A central air conditioner alone, keeping your furnace, installed
$5,942 to $14,450
or $99/mo at 0% APR for 60 months
An air conditioner and furnace together, installed
$8,898 to $23,000
or $148/mo at 0% APR for 60 months
A heat pump in the AC’s place, installed
$8,499 to $21,650
or $142/mo at 0% APR for 60 months
Diagnostic visit, if it may be worth fixing
$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
The HVAC replacement cost estimator narrows it to your house. Then a tech measures, and you get the installed price in writing before anything is ordered.
With Comfort+ membership at $199 a year, the diagnostic visit is included, and half of each repair bill is banked toward replacing that system, up to $1,500.
What’s different in Dumfries
An AC-only job in Dumfries belongs to the gas houses. Inside the Town, 598 of the 1,375 owner homes heat with utility gas and 81 with propane: a furnace indoors, a separate air conditioner out back. The Town’s electric half mostly runs heat pumps instead, a separate job. Cherry Hill leans hardest toward gas, about seven owners in ten, so most of its condensers are AC-only work.
The Town’s busiest building decade was the 1980s, 582 of its 1,868 homes, and Montclair’s median house dates to 1989. A house that age is on its second air conditioner or later, and a second unit from the 2000s probably holds R-22. Cherry Hill, median 2005, is the younger story: a lot of its condensers are still the builder’s, now around twenty years in.
Williamstown, Port O’Dumfries and South Cove, built 1974 through 1992 by Town records, line up more than 850 townhouses, and behind each one the condenser sits on a small pad between the neighbors’ units, often hemmed in by a fence or a deck. The new one has to fit that pad with the breathing room its maker asks for. In a gas row house the furnace usually sits in a closet or the attic, so the new coil goes on top of it up there.
The town line sets the paperwork, and a Dumfries mailing address won’t tell you which side you’re on. Inside it, the Town runs its own building department, and its mechanical permit form carries a line for AC equipment replacement, indoor, outdoor or both, filed with a copy of the contractor’s state license. In the historic district, the Town Code holds building permits until a certificate of appropriateness is approved. Montclair, Southbridge and Cherry Hill go to Prince William County instead.
Neighborhood by neighborhood
Census figures for the owner-occupied homes in each place, and what that usually means for the AC that’s there now.
| Place | Median home built | Most homes are | Heated with | The AC there now |
|---|---|---|---|---|
| Montclair | 1989 | single-family houses, about 8 in 10 | electricity, about 5 in 10 | Mostly electric heat, so the cooling is usually a heat pump. |
| Cherry Hill | 2005 | townhouses, about 4 in 10 | gas, about 7 in 10 | Townhouse condensers in tight side yards and on decks. |
| Dumfries | 1985 | townhouses, about 4 in 10 | electricity, about 5 in 10 | Mostly electric heat, so the cooling is usually a heat pump. |
By the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
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.
When it’s time
A condenser that needs a charge every summer has a leak. On the R-22 unit from a Dumfries house’s second round of equipment, each refill is reclaimed refrigerant at that season’s going rate. Two refills in, the money is better spent on a new AC for the gas furnace you have.
An air conditioner put in before 2010 most likely holds R-22, which hasn’t been made since 2020. A leak on one of those usually ends the repair road.
A house from the 2000s often cools with the condenser it was built with. Past fifteen years, compressors and fan motors start to go, one after another.
Permits, locally
Prince William County lists any work that alters a home’s heating and air conditioning as permit work, but swapping an electric furnace, heat pump or air conditioning condensing unit for the same type of unit in the same spot is an ordinary repair that needs no permit. Source.
Our Virginia Class A contractor license, 2705192276, is on the side of the van.
Choosing who installs it
Questions to ask anybody who quotes you, us included.
A new condenser’s footprint may not match the old one’s. In a Williamstown or South Cove row, ask them to measure the pad, the fence and the deck first, so the unit that shows up fits with its maker’s clearances. If it won’t, you should hear so with the quote.
Ask how they picked the size. Copying the old nameplate repeats whatever was guessed when the house was built.
The outdoor unit and the coil on the furnace are rated as a pair. Ask whether the quote replaces both, and what happens to the line set.
A good company puts the repair price next to the replacement range and lets you choose. Already holding somebody’s big number? Take the free second opinion first.
Two of our crew going over a work order before the day's calls.
From our Google reviews
5.0 stars across 1,131 reviews. Read them on our reviews page.
Tyler from SwiftPro is very knowledgeable and professional on HVAC. Tech Edis and Rony are very professional and done good job to install AC
Where we work
Next door to Dumfries: Triangle, Quantico, Woodbridge, Lorton and Stafford.
Questions
Yes, and it’s worth pricing: a heat pump on the gas furnace runs $8,499 to $21,650 installed. Washington Gas pays toward a dual fuel heat pump only when it replaces a central air conditioner in a house keeping its gas furnace, and the Town lists both Columbia Gas and Washington Gas, so check your bill first.
No. Montclair in 22025 and Southbridge in 22026 carry Dumfries mail but sit in Prince William County, outside the town line. The county’s no-permit list takes a matching condenser on the old pad; a move, or a switch to a heat pump, doesn’t qualify.
$5,942 to $14,450 installed for a central air conditioner on its own, keeping the furnace you have; size and efficiency set where yours lands. An AC and furnace together run $8,898 to $23,000. The HVAC replacement cost estimator gives your house its own number.
It’s worth pricing. A heat pump cools exactly like an AC and also heats on mild days, so with your gas furnace it becomes dual fuel. A heat pump system runs $8,499 to $21,650 installed, and we’ll price it both ways.
Ready when you are
Call, or send the form at the top. A tech measures the house and puts the installed price in writing before anything is ordered, and if the old AC is worth fixing, 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 1,131 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.