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Plan on $5,942 to $14,450 installed for Catharpin AC replacement, while the furnace you heat with stays. In 20143 that’s mostly a propane house’s job.
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.
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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 Catharpin
Start with what heats the house. Nearly half the owner homes in 20143 run on electricity, mostly through heat pumps that cool as well, and those get swapped as heat pumps. About one in three heat with propane. There a furnace heats and a separate condenser cools, so a worn condenser gets replaced alone, along with the coil sitting on that propane furnace.
Catharpin was built in four rounds. About one home in five dates from before 1960, roughly as many from the 1960s and 70s, another fifth from 1980 through 1999, and nearly four in ten since 2000. A house from the first round got its central air added along the way and is likely on its second or third condenser. A 2000s house may still run the builder’s unit, and if it predates 2010 it’s probably charged with R-22.
Outdoor units here take real weather. Hail up to ping pong ball size fell near Catharpin on August 18, 2011, and the June 2020 storm that blew down numerous large trees near Sudley Springs and Catharpin carried winds estimated near 69 mph. Hail flattens the thin fins on a condenser coil, and a unit breathing through bent fins runs longer for less cooling. On a young unit that’s worth straightening; on an old one it usually tips the math toward a new condenser.
Dulles, the nearest full weather record, logs 32.7 days a year at 90 or hotter, Manassas closer to 40.5, and July’s average low there is 66.8 degrees, so a condenser gets little rest overnight. In a house from the 1986 median or earlier, an addition or a finished basement has often changed the house since the old unit was picked, so the tech measures the rooms rather than trusting its label. The answer can come out smaller.
When it’s time
That’s years of storms written on the coil. Straightening helps, but on a condenser from before 2010 that’s battered and short of breath in July, the honest move is to price a new one. With a propane furnace inside, only the outdoor unit and coil change.
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.
Permits, locally
Prince William County lists any work that alters a home’s heating and air conditioning as permit work, but swapping an electric furnace, heat pump or air conditioning condensing unit for the same type of unit in the same spot is an ordinary repair that needs no permit. 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.
In a Catharpin propane house a heat pump can take the AC’s pad, cool the same way and carry the mild heating days, with the propane furnace covering the cold ones. Installed, that’s $8,499 to $21,650 against $5,942 to $14,450 for the AC alone. A good quote puts both side by side.
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 Catharpin: Gainesville, Haymarket, Centreville, Chantilly and Bristow.
Questions
Probably not. Electric heat in 20143 mostly runs through heat pumps, and since that outdoor unit warms the house too, it’s replaced as a heat pump system at $8,499 to $21,650. The tell is January: if the outdoor unit runs in winter, it’s a heat pump. If it sits idle until spring, an AC alone fits.
Only if the old spot has a real problem, like a limb overhead or a low corner that holds water; Little Bull Run floods Artemus Road and Pageland Lane often enough to have its own flood gauge. Prince William County’s no-permit swap covers the same type in the same place, so a move brings paperwork.
$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 Catharpin 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.