Open 24/7 for emergencies
AC replacement in Warrenton runs $5,942 to $14,450 installed, and with gas heating most of the town, 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 Warrenton
Most Warrenton houses that need a new air conditioner keep their furnace. Inside the town limits, 1,525 of the 2,509 owner homes heat with natural gas, and in New Baltimore, out on the county side of 20187, close to half of the 3,545 owner homes do, with about one in seven more on propane. In each of those, the cooling coil sits on the furnace and its blower moves the air. When the outdoor unit fails and the furnace is sound, the condenser and coil are the whole job. Heat pump houses are a different replacement, $8,499 to $21,650 installed.
Age sorts the work. The town added about 1,425 homes in the 1980s and 1990s and about 950 from 2000 through 2009, and New Baltimore about 1,000 in the 2000s alone. In town, a 1990s house has had thirty-odd summers, more than one condenser’s worth. A 2000s house may still have the builder’s, near twenty years old and likely charged with R-22, so every pound added for a leak comes out of old stock.
Townhouses are 874 of the town’s homes, and their condensers usually sit on small pads out back. Whatever replaces yours has to squeeze onto that pad with the clearances its maker asks for. Inside the limits, the Town’s permit list covers houses, duplexes and townhouses and treats apartment and condo buildings as commercial projects, and where there’s an association, it decides where outdoor equipment goes. A unit moved somewhere new, or rewired, is Town permit work.
In the Historic District around Main Street, the condenser counts as an outside change. The Town wants a Certificate of Appropriateness for exterior work; its staff can approve small, compatible jobs, in-kind replacement included, while bigger changes go to the Architectural Review Board, which meets monthly and takes applications by the 1st. The Town’s design guidelines call a ground unit on the front of a contributing building inappropriate and want visible refrigerant lines painted or covered. A same-spot swap is the simple case; plan a new location around the Board’s calendar.
Neighborhood by neighborhood
Census figures for the owner-occupied homes in each place, and what that usually means for the AC that’s there now.
| Place | Median home built | Most homes are | Heated with | The AC there now |
|---|---|---|---|---|
| New Baltimore | 1999 | single-family houses, nearly all | gas, about 5 in 10 | 1980s and 90s houses, many on their second air conditioner. |
| Warrenton | 1993 | single-family houses, about 5 in 10 | gas, about 6 in 10 | 1980s and 90s houses, many on their second air conditioner. |
By the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
Inside the town limits, a little over 4 of the roughly 110 square miles the two Warrenton ZIP codes cover: the Historic District around Main Street, Leeds Square, and the streets off Broadview Avenue and Alwington Boulevard.
New Baltimore only. It’s the one Census place on the county side with mostly Warrenton mail, so the farms and lots beyond it aren’t in these figures.
When it’s time
Furnaces tend to get replaced after a winter breakdown while the air conditioner waits its turn, so the two halves drift apart in age. If the furnace is ten or more years younger than the condenser, keep it. The new coil gets matched to its cabinet and blower.
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.
Permits, locally
Inside the town limits, any work that alters a house’s plumbing, electrical or HVAC system is on the Town’s list of jobs that always need a permit. Source.
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.
A Warrenton townhouse furnace often stands in a closet or lies on its side in the attic, with the coil fastened to it. The new coil has to match that furnace’s width and position and fit through the same door or hatch. Ask whether whoever quoted went and looked.
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!
Questions
Only if both are due. Plenty of two-story houses out there cool the bedrooms with a second system in the attic, and both may date from the build. If one pair is sound, replace the failing air conditioner now and price the other for later; each gets its own quote.
It depends on the address, not the ZIP. Nearly all of the town is in 20186, which also takes in county land, while 20187 is mostly New Baltimore and Vint Hill with a small corner of town. Inside the limits it’s the Town’s own Building office; outside them, Fauquier County.
$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 Warrenton 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.