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AC replacement in Annandale runs $5,942 to $14,450 installed: a new condenser and coil on the gas furnace most owners here heat with.
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 Annandale
Gas heats about seven in ten owner homes in Annandale, so the usual job here is the cooling half alone: a new condenser on the pad out back and a new coil on top of the furnace that stays. In a rambler that furnace stands in the basement; in a split-level it’s on the lowest floor, often behind a door off the family room. The coil gets replaced with the condenser because a new A2L unit is built to work with its own matched coil, not one from the R-22 years. Fairfax County counts the swap as mechanical permit work.
The median owner home here went up in 1967, and about eight in ten were built before 1980. An air conditioner lasts somewhere around fifteen to eighteen years, so a house that age is likely on its third or fourth, and a condenser put in before 2010 most likely holds R-22. What usually hasn’t changed is the sheet-metal trunk under the basement ceiling. A new AC can only push as much air as those ducts will carry, so the tech checks the returns and the static pressure before settling on a size.
Ductless mini-splits are a bigger part of our Annandale work than anywhere else we work regularly. In a 1960s house the rooms added later, a family room off the back or a lower level finished decades on, are often the ones the original ducts never reached, and a wall head cools them instead. Replacing the central AC leaves those heads alone. Tell us which rooms run on the mini split, so the new condenser is sized for the part of the house the ducts actually serve.
The rest of Annandale lives closer together. Garden-style condo and apartment buildings cluster around the business district where Little River Turnpike meets Columbia Pike, northwest of Backlick Road and I-495, and east of Heritage Drive, and about a fifth of homes are in buildings like that. The townhouse rows on the north side of Braddock Road, east of Wakefield Chapel Road, keep their condensers in small back yards, so the new unit has to fit the old pad. About three in ten homes here are rented, and there the call is the landlord’s.
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 |
|---|---|---|---|---|
| Annandale | 1967 | single-family houses, about 5 in 10 | gas, about 7 in 10 | Gas furnaces with central air, often on the second or third AC. |
| Wakefield | 1968 | single-family houses, nearly all | gas, about 8 in 10 | Gas furnaces with central air, often on the second or third AC. |
| Woodburn | 1968 | single-family houses, about 4 in 10 | gas, about 6 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.
When it’s time
A condenser from before 2010 in an Annandale yard most likely runs on R-22. Every top-off of a refrigerant that hasn’t been made since 2020 costs more than the last, and a leak that keeps coming back often means the coil on the furnace is failing too. That’s the point to price the condenser and coil together and stop buying 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 a 22003 house with a wall head in the addition, the central AC only has to cover the rooms on the ducts. An installer who sizes it for the whole floor plan, or copies the old nameplate, can end up with a unit that runs in short bursts and leaves the air damp. Ask them to show you the math.
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 Annandale: Falls Church, Springfield, Dunn Loring, Burke and Fairfax.
Questions
Yes. The county lists replacing a cooling system as mechanical permit work, and since new air conditioners run on A2L refrigerants, it also wants a certification for that refrigeration system turned in with the permit. Ask whoever quotes you whether the permit is in their number and who meets the inspector.
Usually, if the condenser is yours. In Annandale’s garden-style buildings the outdoor units often share a pad or sit on the roof, and the condo documents say whose each one is and what a replacement has to look like. Check with the management office first; then we replace the condenser and the coil in your closet as a pair.
$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 Annandale 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.