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AC replacement in Casanova runs $5,942 to $14,450 installed, keeping the propane furnace that already heats the house.
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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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 Casanova
Mail to Casanova goes to 20139, a ZIP of post office boxes with no mapped area, so the Census numbers here come from 20119, the Catlett ZIP area around the village. A little over half the owner homes there heat with electricity, close to three in ten with propane, and none with utility gas. The propane houses are where an air conditioner gets replaced on its own: the tank-fed furnace stays, while the condenser and the coil it feeds are swapped. About one in eight lists wood or another fuel as its main heat, and where a wood-heated house cools with a central AC over a backup furnace, the same swap applies.
The village began as Three Mile Station, three miles out along the Warrenton Branch railroad, and the frame I-houses of its historic district date from roughly 1880 to 1910. They were built for stoves and fireplaces, so central air in one came as a later addition, with ducts threaded through an attic or closets decades after the walls went up. On replacement day that history sets the limit: the new AC has to match the air those runs can carry, which can be less than a modern unit expects. The farm-road houses beyond the village are mostly younger, near the 1990 median for 20119, with their ducts built in.
Casanova’s weather record sits close by. NOAA’s Warrenton 3 SE station is about three miles west-northwest of the village, so its normals likely track your own yard: a July afternoon of 84.9 degrees, about 21 days a year at 90 or hotter, and July nights near 66. It read 95 on July 22, 2011, then 99 on July 23. That’s a moderate cooling load with a few hard spells, and it’s why a new unit sized room by room can come out smaller than the one it replaces. An oversized unit in that climate chills the air in short bursts and leaves the damp behind.
Where the lot sits matters more than the ZIP. FEMA maps the ground around the Casanova crossroads as Zone X, minimal flood hazard, but it marks a Zone A floodplain along Turkey Run at Meetze Road, and roads nearby go under: Rogues Road closed in November 2020, and a foot of water crossed Balls Mill Road near Moopack Lane in July 2025. On a low lot, the new condenser goes on a stand. Wind reaches the high lots too. On August 13, 2021, gusts estimated at 60 knots brought down numerous trees at Casanova Road and Meetze Road, and a condenser replaced under the same limbs is waiting for the next storm.
By the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
Casanova’s own ZIP, 20139, is post office boxes only, so the Census Bureau maps no area for it. These are ZIP 20119 as a whole, the Catlett ZIP area Casanova sits in.
When it’s time
In a two-story house one room deep, the bedrooms sit under the roof at the far end of the longest duct runs. When a tired AC loses capacity, those rooms go first. If the condenser holds R-22 and has started leaking, a new unit matched to the ducts usually makes more sense than another recharge of a refrigerant that’s out of production. Book the $99 diagnostic first and it sorts a fixable fault from a worn-out condenser.
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.
Ask how the size was picked and whether anyone measured the ducts. In a Casanova village house those runs went in long after it was built, and a new AC can only push what they’ll carry; too much unit and it short-cycles. In a farm-road house from around 1990, ask the same, and confirm the quote replaces the coil on the propane furnace along with the condenser outside.
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
Questions
It can be. About one owner home in eight across 20119 lists wood or another fuel as its main heat, and a stove does nothing for July. If the house has a central AC sitting on a backup propane furnace, that AC can be replaced alone and the furnace kept for the nights the stove goes unlit. If the cooling comes from a heat pump instead, it’s a heat pump job, and with no ducts at all, ductless is the road.
It could, if the old size was a guess or the house has changed since. A room-by-room count looks at walls, windows, insulation and which way the house faces, against summers like Warrenton 3 SE’s three miles off, with about 21 days a year at 90 or above. If the attic got insulated or the windows were replaced since the last install, the right size can drop, and a unit sized right runs longer, steadier cycles.
$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 Casanova 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.