Open 24/7 for emergencies
AC replacement in Fairfax Station runs $5,942 to $14,450 installed, one air conditioner at a time, and the gas or propane furnace stays.
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 Fairfax Station
Fairfax Station is almost entirely detached houses, and 49 percent of its homes went up in the 1980s alone, eight in ten between 1980 and 1999, the median owner’s in 1988. A builder’s air conditioner from then has very likely been replaced already, and sometimes only halfway: some got a new condenser outside while the old coil stayed on the furnace. That matters now. A new A2L condenser has to be paired with a coil made for it, so if your coil is older than the outdoor unit, this replacement swaps both.
Size runs big here. In 22039, 92 percent of homes have four bedrooms or more, against 40 percent across Fairfax County, and a house like that often cools the bedrooms on a second system, its air handler in the attic. Each one is its own air conditioner, and you can replace the one that failed without touching the other. The attic one is the harder job: the hatch, the pull-down stairs, the platform and the drain pan all shape it, so get it priced by somebody who climbed up to look.
Gas heats about six in ten owner homes, most heavily in the subdivisions of South Run and Crosspointe, where the coil sits on a gas furnace in the basement and an AC-only swap is the usual job. Propane heats more homes out on the big lots than across the ZIP, and a propane furnace takes a new air conditioner the same way. About a third of owners heat with electricity, more of them on the big lots than in the subdivisions, and in those houses the outdoor unit is usually a heat pump, a different job at $8,499 to $21,650 for the system.
West of Ox Road the county plans for one house per five to ten acres, and the ZIP takes in the woods of Burke Lake Park and Fountainhead Regional Park. On a lot like that the condenser usually has room, so the question at replacement is where it should sit: out of the mower’s line of fire, clear of the drip line under the trees, a couple of feet off shrubs planted in the 1980s. If a standby generator backs up the house, it was sized for the old compressor, and the new one’s draw gets checked against it.
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 |
|---|---|---|---|---|
| Fairfax Station | 1982 | single-family houses, about 9 in 10 | gas, about 5 in 10 | 1980s and 90s houses, many on their second air conditioner. |
| South Run | 1988 | single-family houses, nearly all | gas, about 9 in 10 | 1980s and 90s houses, many on their second air conditioner. |
| Crosspointe | 1993 | single-family houses, nearly all | gas, about 8 in 10 | 1980s and 90s houses, many on their second air conditioner. |
By the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
ZIP 22039 as a whole: every Fairfax Station address. The Fairfax Station Census place in the table also takes in streets with Fairfax mail.
When it’s time
In a 1980s Fairfax Station house, a condenser swapped in on its own years ago may be working against the original coil on the furnace, and the mismatch shows up as long run times and rooms that never quite cool. When that condenser fails, don’t repeat that partial swap: price the outdoor unit and the coil together, matched for the new refrigerant.
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.
It’s the pump at the heart of the outdoor unit and its costliest part. Out of warranty on an older unit, the repair can come close to half the price of a new AC, the point where Goodman says replacing may be the better money.
Permits, locally
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.
In a house where the outdoor unit was replaced once already, the coil on the furnace can be a decade older. Ask the installer to find its label and tell you what refrigerant it was built for. A quote that keeps an R-22 era coil under a new A2L condenser isn’t a matched system, whatever it costs.
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.
Alex was very professional and the 2 technicians Oscar, and Derek was fast and efficient. They replace my A/C unit within the next day
Where we work
Next door to Fairfax Station: Burke, Clifton, Springfield, Fairfax and Annandale.
Questions
Yes. The attic system is its own air conditioner, with its own condenser out back and its own coil up top, so it can be replaced without touching the one that cools the main floors. Up there the job takes in the coil, a new drain pan under it and a check that the copper lines suit the new refrigerant. An attic swap still goes through a Fairfax County mechanical permit, the same as a basement one.
Probably not, but check. Crosspointe’s median owner home dates from 1993, so a builder condenser there would be past thirty summers, and plenty have been swapped. The refrigerant printed on its data plate tells you which era yours comes from: on R-22, a leak usually settles it, while a unit on anything newer can still be recharged, so fixing it may be the better first call.
$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 Fairfax Station 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.