Open 24/7 for emergencies
AC replacement in Catlett runs $5,942 to $14,450 installed. In 20119 that’s a propane house’s job: new cooling, same 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 Catlett
The Census sorts the 1,040 owner homes in ZIP 20119, every Catlett address included, by what heats them: 526 with electricity, 301 with propane, 131 with wood or another fuel, and none with utility gas. Those 301 propane houses are where a cooling-only swap fits. In those houses a propane furnace does the heating, a coil set on top of it does the cooling, and the condenser outside throws the heat away. When that outdoor unit wears out and the furnace is sound, the cooling side changes and the propane side doesn’t. The 526 electric houses mostly run heat pumps, a separate job at $8,499 to $21,650.
Next, read the year on the label. The ZIP counts 270 homes from the 1990s and 201 from the 2000s. A 1990s house is on its second condenser at least, and a house from the 2000s may still run the builder’s, put in while new R-22 systems were still being sold. R-22 hasn’t been produced since 2020, so a leak on one of those means buying scarce refrigerant to keep a unit near the end of its expected life going, and that’s where a new AC usually wins. A unit from the last decade or so uses a refrigerant that can still be serviced, and a leak there is often worth fixing.
Cedar Run decides where the new unit stands. The Weather Service calls 15 feet on the Catlett gauge minor flooding, the point where water reaches the low spot on Flatwood Lane, and the creek topped that in July 2013, April 2014 and July 2025. At 21 feet the Route 806 bridge goes under and nearby buildings take water. A condenser on a ground pad near the creek is the first equipment the water finds, with its compressor and wiring low in the cabinet. If yours sits where water has stood, ask for a stand above that mark, and expect the quote to say whether the new spot means a Fauquier County permit.
Summer’s numbers are moderate and its storms aren’t. Warrenton 3 SE, about seven miles west-northwest, averages an 84.9 degree July afternoon and about 21 days a year at 90 or above, and it read 99 on July 23, 2011, the top of its 2011 to 2016 daily record. Quarter-size hail fell in Catlett on April 15, 2024, and gusts near 75 mph took trees down on Old Dumfries Road and Casanova Road on August 13, 2021. Flattened fins on a young condenser comb back open. On a builder’s unit that already needs R-22, storm damage tends to settle the repair-or-replace question in favor of a new AC on the same furnace.
By the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
ZIP 20119 as a whole: every Catlett address, the village included. The Census place for the village alone has too few homes for steady figures.
When it’s time
That combination is the clearest case for replacing only the AC. The refrigerant is out of production, the condenser is near or past its expected life, and the propane furnace under the coil still has years left. Read both labels. If the furnace is newer by a good margin, a new condenser and coil make sense, and the $99 diagnostic prices the leak repair too, so you can compare.
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.
Around a village with floodplain on the County’s map, height matters as much as size. Ask whether the quote sets the new unit on the old pad or on a stand, how high it lifts it, and whether a new location brings a Fauquier County permit. Ask too whether the old line set gets replaced or flushed, since an R-22 line can hold oil that a new system’s refrigerant shouldn’t mix with.
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 Catlett: Calverton, Casanova, Midland, Nokesville and Bristow.
Questions
It depends on what bothers you in summer. With about 21 days a year at 90 or above at Warrenton 3 SE and roughly 1,020 cooling degree days, a Catlett AC spends most of its hours on warm days, not scorching ones. A two-stage unit runs its low stage through those, longer and steadier, which helps pull damp out of the air. It sits higher in $5,942 to $14,450. A single-stage unit sized to the house does the job too.
It can be. Warrenton 3 SE puts the median first freeze around November 1, so the weeks after the last hot spell and before the furnace works hard are the easiest time to be without cooling while the work is done. A unit that limped through August is a fair candidate. Spring works as well, with the median last freeze there around April 9; just book before the first 90 degree days arrive.
$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 Catlett 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.