Open 24/7 for emergencies
AC replacement in Paeonian Springs runs $5,942 to $14,450 installed, for the propane houses keeping their furnace.
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 Paeonian Springs
Propane heats 47 percent of owner homes in ZIP 20129, electricity 35 and oil 18, and the Census finds no natural gas at all. The propane houses are the ones this page fits: a furnace burning from a tank on the lot, with a coil on top and a condenser outside doing the cooling. When the condenser wears out, it and its coil get replaced and the furnace stays. The electric houses mostly run heat pumps, one outdoor unit doing both seasons, and swapping one of those is priced as a heat pump system, $8,499 to $21,650.
The village began as a summer escape: families came for the spring water and to get away from the city’s humid summers. Central air does that job now, and the Purcellville station still logs a July average high of 86.4 and about 30 days a year at 90 or above, roughly 1,050 cooling degree days in all. That’s enough to wear a condenser out, but not enough to justify one bigger than the house needs. Sized to the house, it runs long enough on a muggy afternoon to pull the damp out along with the heat.
Then there’s age. The median owner home here was built in 1997, so an original condenser would be nearly three decades old, far past the roughly 18 years federal planners give one in Virginia, and most of these houses are likely on a second unit by now. Which second unit matters: a unit set before 2010 is probably on R-22, out of production since 2020, while a later one uses a refrigerant that can still be serviced. A new AC runs on an A2L refrigerant with its own matched coil, so the old coil on the furnace comes out with it.
Trees are the local hazard. On July 15, 2024, winds estimated near 75 mph brought down dozens of large trees, wires and a few poles at Clarkes Gap Road and Hurley Lane, and on June 19, 2017, storm winds snapped big poplars 10 to 20 feet up along Tim Tact Court. A new condenser usually goes on the old pad, unless there’s a reason to move it, and a big tree overhead is a reason. Moving it means longer copper and a new pad, and the quote should price that plainly.
When it’s time
If your house’s second condenser went in before 2010, read its nameplate. On R-22, a leak means buying refrigerant that hasn’t been produced since 2020, and a top-off only holds until it leaks out again. That’s the point to get the $99 diagnostic with the replacement range beside it, and to keep the propane furnace if it’s sound.
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.
The Department of Energy plans on about 18 years for a central air conditioner in Virginia’s climate. Past fifteen, parts get harder to find and each repair buys less time.
Choosing who installs it
Questions to ask anybody who quotes you, us included.
Your furnace’s blower is what pushes the new AC’s cold air through the house, so it has to move the air the new unit is rated for. On a furnace near three decades old, ask what the tech found with its cabinet open, and whether the quote assumes the furnace stays for years or is the next thing to go.
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 Paeonian Springs: Waterford, Hamilton, Leesburg, Lovettsville and Purcellville.
Questions
Price it both ways. A propane furnace from 1997 is near the end of its own run, and it carries the cooling air too, so the pair, $8,898 to $23,000, can make more sense than putting a new AC on an old furnace. If the furnace runs clean and the $99 diagnostic finds it sound, an AC alone is a fair choice. The written quote should show both numbers.
Usually not. When the lines come back, a surge or a hard restart can take out a capacitor or a contactor, and storms here bring wires down: dozens of trees and wires blocked Route 7 and Hamilton Station Road on June 2, 2022. Reset the breaker once and leave it off if it trips again. The diagnostic finds the part, and you decide whether an old unit deserves it.
$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 Paeonian Springs 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.