Open 24/7 for emergencies
AC replacement in Round Hill runs $5,942 to $14,450 installed, keeping your propane furnace in place.
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
Send this and the office calls or texts you back to set a time.
We’ll call or text this number about your request. By sending it you agree to our terms and privacy policy.
Rather talk now? (703) 997-9757
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 Round Hill
Round Hill grew fast. The Town’s utility plan describes very rapid growth from the mid 1990s through 2005, and the Census dates 604 homes in 20141 to the 1990s and 871 to the 2000s, which puts the median owner home at 2004. Condensers from that boom have twenty to thirty summers on them now, past the roughly 18 that federal planners use for central air in Virginia. The boom’s earlier units mostly run R-22, and with no fresh R-22 made since 2020, a leak in one of them tends to settle the question in favor of a new AC.
Which page you need depends on the tank in the yard. Of the ZIP’s 2,362 owner homes, 953 heat with propane, and those houses have a furnace inside with the cooling attached to it: a coil on top, a condenser out back. When the condenser is the worn part, it and a matched coil get replaced and the propane furnace keeps heating. The 1,257 all-electric homes are the other story, a heat pump and an air handler, and their replacement is a heat pump system, $8,499 to $21,650. Piped gas reaches only 46 owner homes.
Inside the town limits, most houses went up before the end of the 1920s, the Town’s plan says, so their cooling came decades later, often as an air handler in the attic with ducts dropped to the rooms below. Replacing the AC in a house like that can mean the condenser outside and the attic unit together, not a coil on a furnace. Round Hill doesn’t run a town historic district the way Leesburg, Middleburg and Purcellville do, so where the new condenser goes is mostly a question of room, noise and the neighbors’ windows.
Storms are the other way a condenser here gets retired early. Winds near 61 knots uprooted big trees along New Cut Road, Bell Road and Main Street on June 16, 2016, and quarter-size hail fell in town on July 25, 2023. Hail like that crushes the thin aluminum fins across the coil’s face, and a twenty-year-old unit with a hammered coil is rarely worth reviving. Water is the third risk: torrential rain closed Main Street at Greenwood Drive in July 2017, and a unit that has sat in floodwater stays off until it’s checked.
By the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
ZIP 20141 as a whole: every Round Hill address, the Town and the neighborhoods around it. The Census place for the Town alone has too few homes for steady figures.
When it’s time
Builder systems were often sized on the generous side, and an oversized AC chills the air in short bursts without running long enough to dry it. If your Round Hill house feels cold and clammy at once, the replacement is the chance to size it right from a load calculation. Get the $99 diagnostic first if the old unit might still be worth a repair.
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.
It may need to. A spotter measured 36.3 inches of snow a mile west-northwest of town in January 2016, and summer rain pools in low corners of a lot. A cooling-only unit sits idle all winter, but snow packed into its coil and a pad sunk in mud still shorten its life. Ask what the installer sets it on, and whether the old pad is still level.
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 Round Hill: Purcellville, Bluemont, Philomont, Hamilton and Middleburg.
Questions
Loudoun County, for addresses in 20141 inside the town limits and out. Its fee schedule lists replacing central heating and air conditioning as permit work. The Town’s own zoning permit is for new work such as additions, decks and finished basements, and once the Town approves that zoning, it sends you on to the County’s Department of Building and Development for the building permit.
Not automatically. A 2004 condenser most likely runs on R-22 and has twenty-odd summers on it, so a big repair deserves a replacement price beside it. A small one, a capacitor or a contactor, can still be worth doing to get through a season while you plan. The $99 diagnostic tells you which you’re facing, and the propane furnace stays out of it either way.
$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 Round Hill 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.