Open 24/7 for emergencies
AC replacement in Philomont runs $5,942 to $14,450 installed, on the propane or gas furnace you already have.
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 Philomont
Philomont’s Census figures come from ZIP 20132, the Purcellville ZIP area the village sits in, and there propane and electricity are a dead heat: about 42 percent of owner homes each. Natural gas adds about 6 percent. The propane and gas houses, close to half, have a furnace with a separate air conditioner on it, and that’s the pairing where a worn condenser and its coil can be replaced on their own. The electric houses mostly heat with a heat pump, so a failing outdoor unit there gets replaced as a heat pump system, $8,499 to $21,650, not as an AC.
The ZIP’s median owner home dates to 2000, and close to half its homes went up since then, so plenty of the air conditioners out here are builder originals or their first replacements. An original from a 2000 house has run more than two decades, past the roughly 18 years federal planners count on for central air in Virginia, and it most likely holds R-22, which stopped being produced in 2020. Houses that got a newer condenser after 2010 are in better shape: its refrigerant is still made for service, and a leak or a dead fan motor on it is normally worth fixing.
The village sits between two streams, a Butcher’s Branch tributary to the north and a Beaverdam Creek tributary to the south, and the water does come up: flooding closed Snickersville Turnpike near Hibbs Bridge Road, about a mile south-southeast, on September 28, 2018 and again that December. An outdoor unit on a low pad in a wet corner of the lot is worth raising when it’s replaced. And a condenser that has sat in standing water should stay off until its wiring and controls have been checked, whatever its age.
About 85 percent of homes in the ZIP area are detached houses on their own lots, so the condenser usually has room; the question is what hangs over it. Trees came down on wires at Snickersville Turnpike and JEB Stuart Road in June 2016, and multiple trees fell across roads south of the village on July 16, 2024. When the old unit comes out, its spot gets a look: clear of overhanging limbs, a few feet off the house wall, and close enough to keep the copper run to the furnace short. A longer run works too, sized for the new unit.
By the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
Philomont’s own ZIP, 20131, is post office boxes only, so the Census Bureau maps no area for it. These are ZIP 20132 as a whole, the Purcellville ZIP area Philomont sits in, the Town of Purcellville included.
When it’s time
Frost on the larger copper line at the outdoor unit on a summer day usually means low refrigerant or weak airflow. If the condenser went in after 2010, fixing the leak or the airflow is normally the answer. On a 2000-era original holding R-22, it’s the point to set the $99 diagnostic beside the replacement range, with the propane furnace staying if it checks out.
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.
A house from the 2000s often cools with the condenser it was built with. Past fifteen years, compressors and fan motors start to go, one after another.
Choosing who installs it
Questions to ask anybody who quotes you, us included.
The copper between the condenser and the coil on your propane furnace has to suit the new unit’s refrigerant and size. Some old line sets can be flushed and reused; others are the wrong size or buried in a wall where they can’t be checked. Ask which the quote assumes, and what changes if the installer finds otherwise on install day.
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 Philomont: Middleburg, Round Hill, Bluemont, Purcellville and Hamilton.
Questions
Roughly. Philomont’s own ZIP, 20131, is post office boxes only, so the Census Bureau maps no area for it, and the nearest figures are ZIP 20132 as a whole, the Town of Purcellville included. A village house can be older or newer than that ZIP’s 2000 median. The data plate on your condenser says more about your AC than any Census table: its year and its refrigerant.
It’s a fair one. The Purcellville station, 6.2 miles north-northeast, averages a July high of 86.4 and 30.2 days a year at 90 or above. A sound system can run nonstop on those afternoons and still hold the house within a few degrees of the setting. One that loses ground on an 85-degree day has a problem, and the diagnostic finds out whether it’s a part or the whole unit.
$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 Philomont 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.