Open 24/7 for emergencies
AC replacement in Delaplane runs $5,942 to $14,450 installed. Propane heats over half the owner homes in 20144, so the furnace usually 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 Delaplane
Delaplane is propane country. The Census counts 228 of the 424 owner homes in ZIP 20144 heating with propane, 127 with electricity and none with utility gas. In a propane house the cooling is its own machine: a condenser in the yard, a coil sitting on the furnace, and the furnace blower pushing the cold air through the rooms. When the condenser wears out and the furnace still has winters in it, the outdoor unit and its coil get replaced and the propane side stays as it is, tank, gas line and burner. The 127 electric houses mostly cool with heat pumps, which is a different job at $8,499 to $21,650.
The houses came mostly in one generation. About half of 20144’s homes went up from 1980 through 1999, and the median owner home dates from 1986, so plenty of Delaplane air conditioners are in their second round, and that round is aging too. A replacement condenser put in during the 2000s, before new R-22 systems ended in 2010, most likely still runs on R-22. When one of those springs a leak, paying to recharge a refrigerant that’s out of production is hard to justify on a unit that age. A unit from after that usually runs a refrigerant that can still be serviced, and a new one runs an A2L.
Down on the valley floor at about 449 feet, beside Goose Creek, summer hangs on. The nearest long-record station, Warrenton 3 SE, averages an 85 degree July afternoon with nights that only fall to about 66, while the Blue Ridge crest at Mount Weather runs two and a half degrees cooler. Hail is what a new condenser here has to live with: golf-ball stones fell at Aspen Dale Winery, about two miles west-southwest, on June 2, 2019. Thin coil fins fold under stones that size, so ask whether the model you’re quoted has louvered or guarded side panels around its coil.
Storms bring the trees down. On June 22, 2022, gusts estimated at 80 to 90 mph laid big trees across power lines along Cobbler Mountain Road between Delaplane and Ashville. In June 2020 a tree fell onto a garage at a Delaplane home, and in July 2025 trees and wires came down at Delaplane Grade Road and Carr Lane. On a wooded lot, the new condenser belongs where a falling trunk misses it, even if that’s a new spot. A move makes it a Fauquier County permit job, so the quote should say whether the condenser keeps its old pad or goes somewhere new.
By the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
ZIP 20144 as a whole: every Delaplane address.
When it’s time
That split happens when a propane furnace fails first and the AC gets left for later. Read both labels. A furnace from the last few years under a condenser that predates 2010 is the textbook AC-only job in a Delaplane propane house: a new outdoor unit and coil matched to the furnace’s blower, with the furnace staying. The $99 diagnostic settles whether the old AC still has a repair in it.
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
Fauquier County counts swapping an electric appliance for a similar one in the same spot as an ordinary repair that needs no permit. Moving an appliance to a new spot takes one. 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.
Almost all of 20144’s homes are detached houses, and a bigger one may run a system for the main floors and another for the bedrooms, each with its own price. If both condensers went in the same year, ask for the second one’s number too, then decide whether to do them together or a summer apart. Either way, each new coil has to match the furnace or air handler it sits on.
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 Delaplane: Rectortown, Upperville, Marshall, The Plains and Orlean.
Questions
Usually, if it already has ducts. Delaplane was Piedmont Station, a Manassas Gap Railroad stop, from 1852 until it took its present name in 1874, and the Crooked Run Valley survey dates the village houses from those years into the early 1900s. Central air in one of them came long after, so the new AC gets sized to the ducts that are there as well as to the rooms. In a house without ducts, ductless is the other road.
Not for the AC itself. The new condenser and coil run on electricity, so the tank, the gas line and the furnace’s burner aren’t part of the job. What the job does touch is the furnace cabinet, where the coil sits, and the blower’s settings, so those get checked. If the furnace itself is near the end, that’s a separate price, and the furnace and AC together run $8,898 to $23,000.
$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 Delaplane 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.