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In the Town of Vienna, a new air conditioner over your gas furnace runs $5,942 to $14,450 installed. 80.1 percent of Town owners burn gas.
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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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 Vienna
Gas does the heating in 80.1 percent of owner homes inside the Town of Vienna and 74.1 percent in Wolf Trap, which makes an AC on its own the usual cooling job here. The furnace keeps heating, and the outdoor unit plus the coil sitting on that furnace get replaced. Which AC you’re replacing depends on which Vienna you live in. The Town was built in two rounds: 65.2 percent of its homes before 1980, 25.4 percent since 2000, and fewer than one in ten in between. Each round brings its own kind of air conditioner to the end of its life.
In the older round, a 1950s or 60s house usually got its central air years after it was built, on ducts laid out for the furnace and a return smaller than cooling wants. The condenser went wherever the yard had room that year, a side yard or a corner by the back steps, and the one there now is often the second or third. If it was swapped in before 2010, it most likely holds R-22, the refrigerant whose manufacture ended in 2020. A new unit can go back in that same corner, sized from the house and its ducts rather than from the old label.
The newer round is mostly rebuilds on infill lots, which the Town reviews on a permit track of its own. Those houses split their cooling across two or three systems, with the bedrooms’ air handler up under the roof. A rebuild from the early 2000s may still run the builder’s condensers, now past twenty and likely on R-22. They went in the same year but seldom quit the same summer, so replace the one that’s failing and get a number on the next. The attic coil sits over a pan with a float switch, above a finished ceiling, so that pan belongs in the quote.
Across the town line, Wolf Trap is 98.8 percent detached houses with a typical build year of 1980, and 35.7 percent went up in the 1980s and 90s, so most are on a second air conditioner by now. About two in ten owners there heat with electricity, and their outdoor unit is a heat pump, priced as one at $8,499 to $21,650. Inside the Town, Fairfax County still issues the mechanical permit, acting as the Town’s building official, with the Town’s approval uploaded to the county’s record and an A2L certification for the new refrigerant.
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 |
|---|---|---|---|---|
| Wolf Trap | 1980 | single-family houses, nearly all | gas, about 7 in 10 | 1980s and 90s houses, many on their second air conditioner. |
| Vienna | 1972 | single-family houses, about 8 in 10 | gas, about 8 in 10 | Gas furnaces with central air, often on the second or third AC. |
By the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
Nearly the whole town sits in 22180, which it shares with county streets toward Dunn Loring and Merrifield.
Vienna mail outside the town line: Wolf Trap and the Tysons edge in 22182, the Oakton side of 22181, Dunn Loring. The figures are Wolf Trap’s, the biggest piece.
When it’s time
A Vienna air conditioner that holds the house in early summer and loses ground once the real heat arrives usually has a tired compressor or a low charge. On a pre-2010 R-22 unit, either one is the start of the end. A $99 diagnostic tells you which, and if the answer is a leak, put the new AC’s price beside the repair before you pay for 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.
The new coil sits on the furnace and uses its blower. When the furnace is the same age, replacing both usually costs less than two jobs a few years apart: $8,898 to $23,000 for the pair.
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 the Windover Heights Historic District, an in-kind replacement doesn’t go to the Board of Review, but an exterior change that isn’t one does. Setting the new condenser where the old one stood keeps you out of it. Moving it, or running new copper up a wall the street can see, may need a Certificate of Appropriateness first. Ask before the unit is ordered.
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 Vienna: Dunn Loring, Oakton, McLean, Fairfax and Reston.
Questions
Often the one serving the bedrooms. Its air handler works under a hot roof, and it carries the rooms that warm up first. Each AC is priced on its own, $5,942 to $14,450 installed apiece, and a tech reads all three labels and runs each system, so you can replace the weakest now and schedule the others with real numbers in hand.
Probably not by itself. In a house that got its cooling late, the far bedroom usually sits at the end of the longest attic run, fed by a return sized for heat. A new condenser cools the air the way the old one did; it can’t push more of it down that run. Have the return and that run measured, and price a ductless head for the room if they come up short.
$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 Vienna 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.