Open 24/7 for emergencies
In Triangle, swapping out a worn central AC costs $5,942 to $14,450 installed, while the gas furnace beside it keeps working.
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
Send this and the office calls or texts you back to set a time.
We’ll call or text this number about your request. By sending it you agree to our terms and privacy policy.
Rather talk now? (703) 997-9757
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 Triangle
Gas heats 1,574 of Triangle’s 2,089 owner homes, about three in four, so the usual setup is a gas furnace indoors feeding a coil, with a cooling-only condenser in the yard. A worn condenser there gets swapped alone, outdoor unit plus the coil on the furnace. The 466 owner homes on electricity mostly run heat pumps, and those get a heat pump replacement, not this job.
The 2000s subdivisions are where it comes up most. Of the owner homes, 915 went up from 2000 through 2009, and County plats date Moncure Woods, Lionsfield Valley and The Reserve at Potomac Crest to 2004. A condenser set that year probably holds R-22, and any leak on it now runs on reclaimed refrigerant. If the furnace in one of those houses was already replaced and the outdoor unit wasn’t, a new AC is the whole job.
The postwar streets are a different job. Carborough Heights was recorded in 1946 and Mockingbird Heights in 1950, before central air was common, so the cooling came later, its ducts slipped in after the fact through closets and attics. A third condenser on those ducts cools only as well as they let it. The tech measures the airflow first; a back bedroom that never cooled may need duct work more than a bigger unit.
Warm Potomac nights put hours on a Triangle condenser: the Quantico air station, 3.8 miles off, averages a July low of 70.7 degrees and 1,512 cooling degree days a year. Placement matters too. Little Creek floods along Fuller Heights Road, and a June 2018 flood put a car underwater where Route 1 meets Fuller Road, so on low ground the new condenser can sit on a raised stand. Swapped on its old pad for the same type, it’s an ordinary repair to the county, with no permit.
By the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
When it’s time
That’s a leak, and on a unit from Triangle’s 2004 plats it’s most likely R-22, topped up from reclaimed stock each time. Have the $99 diagnostic find it once. If the fix is a coil or a compressor on a unit that age, the money belongs in a new condenser instead.
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 and coil are rated for a certain airflow, and ducts added to a 1946 or 1950 house often fall short of it. Ask whether they’ll measure the airflow before quoting, and whether the quote names any duct work needed. Learning it after the install means a new AC that can’t deliver.
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.
On spec and on price for our A/C replacement. Showed up on time and all went as promised
Where we work
Next door to Triangle: Quantico, Dumfries, Woodbridge, Stafford and Lorton.
Questions
Between leases, if the unit is near the end. More than a third of Triangle’s occupied homes are rented, and an R-22 condenser that dies in July costs a tenant’s patience too. The $99 diagnostic tells you whether it has another summer; if not, schedule the swap for the empty weeks.
Most are the county’s, and Prince William County keeps a like-for-like condenser on its old pad off its permit list. Some Triangle addresses fall inside the Dumfries town limits, and those go to the Town’s building department instead, so mention the street when you book.
$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 Triangle 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.