Open 24/7 for emergencies
AC replacement in Middleburg runs $5,942 to $14,450 installed, keeping the furnace, mostly in the propane houses of 20117.
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 Middleburg
Of the 927 owner homes in 20117, the Census counts 582 heating with electricity, which out here mostly means a heat pump that cools as well, and its replacement is a heat pump system, $8,499 to $21,650. An air conditioner on its own belongs to the rest: 187 houses on propane and 41 on piped gas, about a quarter of the ZIP, where a furnace does the heating and the cooling is a separate condenser and coil. In those houses a worn air conditioner can be replaced while a furnace that’s still sound stays where it is.
The older houses are a case of their own. Of the ZIP’s 1,416 homes, 333 went up in 1939 or earlier, generations before central air, and in many of them the cooling came later as its own system: an air handler in the attic feeding the bedrooms, with the furnace left alone in the basement. There, replacing the AC can mean the condenser outside and the attic unit together, since the coil lives in that air handler. Ask that the quote name which pieces it covers, and how the new unit gets up the attic stairs.
Inside the Historic District, the outdoor unit is part of what the street sees. The Town’s design guidelines put heating and cooling equipment in the least visible spot beside the house, enclosed by a screen whose material and color suit it, and steer rooftop units off front roofs. The guideline’s own example screen lets air move through it, and that’s the detail to hold onto: a condenser boxed in tight breathes its own hot exhaust and works harder every afternoon. A new unit is the moment to fix a screen that was built too close.
Summers here run a little gentler than out east. The Purcellville co-op, 12 miles north at about Middleburg’s height, logs around 1,050 cooling degree days a year to Dulles Airport’s 1,233, so the new AC gets sized to this house, not to a chart drawn for somewhere hotter. What ends condensers early is weather: gusts near 69 mph put trees down on Washington Street on June 21, 2021, and golf-ball hail fell just northwest of town on June 16, 2016. Where the old unit sat under a big tree, the new one may deserve a better spot.
By the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
ZIP 20117 as a whole: every Middleburg address, the Town and the farms around it, about a tenth of the land in Fauquier County. The Census place for the Town alone has too few homes for steady figures.
When it’s time
A few bent fins are cosmetic. A coil hammered flat across its face starves the unit of air, and on a condenser past fifteen that’s usually the end of it. Leave it off, look from a few feet away, and book the $99 diagnostic: it says whether the coil can be combed out and cleaned or the unit needs replacing, with both priced.
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.
Choosing who installs it
Questions to ask anybody who quotes you, us included.
About a tenth of 20117’s land is in Fauquier County, where swapping an electric appliance for a similar one in the same spot counts as an ordinary repair and a move takes a permit. On the Loudoun side, the County’s fee schedule lists replacing central air conditioning as mechanical permit work, and inside the town limits that permit also needs the Town’s Zoning Location Permit. The quote should say which applies.
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.
They replaced my AC system and got it up and running with great service. Moises and Efrain are great!
Where we work
Next door to Middleburg: Philomont, Aldie, Round Hill, Hamilton and Purcellville.
Questions
Only if it changes what the street sees. The Town excludes routine maintenance and exact, in-kind replacement from needing a Certificate of Appropriateness. Most new condensers differ in size or shape from the one they replace, so if yours shows from a public street, talk to Planning and Zoning staff before ordering; the application goes in with scale drawings two weeks before the committee’s monthly meeting.
The owner, since the equipment is yours; the tenant’s part is reporting trouble early, before a weak unit quits in July. About one home in four in 20117 is rented. The $99 diagnostic gives you the repair price and the replacement range in writing to decide from, and if your tenant books the visit, tell us who signs off on the number.
$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 Middleburg 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.