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Furnace and AC replacement in Clifton runs $8,898 to $23,000 installed. The typical owner’s house in 20124 is from 1988, likely past its first system.
Price range
$8,898-$23,000
8yrs @ 7.99%
$126/mo
15yrs @ 9.99%
$96/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 1,132 reviews
One of our technicians with a new Trane outdoor unit he just installed beside a Northern Virginia house.
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
$8,898 to $23,000 installed for a furnace and air conditioner replaced together, 2 to 5 ton, from the same price book as our estimator. Where you land depends on the size of the house, the efficiency you pick, and what the ductwork and venting need.
Furnace and AC together, installed
$8,898 to $23,000
or $148/mo at 0% APR for 60 months
Furnace alone, keeping your AC
$4,285 to $14,040
or $71/mo at 0% APR for 60 months
Heat pump system instead
$8,499 to $21,650
or $142/mo at 0% APR for 60 months
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 estimator gives your house its own number. Then we measure, and the price is in writing before anything is ordered.
Two years of labor come with every install. Monthly plans are on our financing page.
What’s different in Clifton
Clifton built most of its houses in one burst. Of the 4,871 homes in 20124, nearly eight in ten went up between 1980 and 1999, and the median owner’s house dates from 1988. Fewer than one in ten were built after 2000. So the furnace and air conditioner a builder set in those years are long gone in most houses, and the pair that took their place, if it went in during the 2000s, is the one coming due now.
That timing is the argument for doing both at once. A pair that went in together has had the same summers and winters since, and whichever half quits first is rarely far ahead of the other. Replacing both also means the sizing gets worked out once, for the house as it stands now: a basement finished since the 1980s, an addition or a sunroom all change the load the builder planned for.
Size is the Clifton question. Six in ten homes in 20124 have nine rooms or more, more than double the Fairfax County share, and a house that big often splits the load across two systems, one in the basement for the main floors and one in the attic or a closet for the bedrooms. Tell our estimator the house is over 3,000 square feet and it says so too: you may need two systems, and its range is for one.
Two corners of Clifton break the pattern. On the big lots off Clifton, Compton and Yates Ford Roads, about half the owner homes heat with electricity, so the system there is usually a heat pump and an air handler, $8,499 to $21,650 installed, not a furnace and AC. Inside the Town of Clifton, where the houses were built long before central air, the cooling came later, so a full replacement starts with whether the ducts can carry what the new system moves.
By the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
Clifton mail outside the town: five- to ten-acre lots in the Occoquan watershed on Clifton, Compton and Yates Ford Roads, mostly on septic, and the 1980s subdivisions off Springstone Drive and Union Mill Road on county sewer.
ZIP 20124 as a whole, the Town included: its own homes are too few for steady Census figures.
When it’s time
If the basement pair and the bedroom pair were replaced together, they’re wearing out together too. Price both now, even if only one goes this year, so the second doesn’t catch you in a July heat wave with no plan.
A new outdoor unit needs a matching coil, and on a gas system the coil sits on the furnace. If the furnace is as old, do both and open that closet once.
The label on its side names the refrigerant. R-22 hasn’t been made or imported in the US since 2020, so a leak gets expensive. Replace it on your schedule, not in July.
Permits and sign-offs
Inside the town line a gas or propane water heater or furnace swap still takes a Fairfax County permit, even like for like, with a chimney vent certification. Fairfax County won’t move the application until the Town of Clifton’s own approval is uploaded to it. Source.
The Town of Clifton doesn’t issue permits or inspect inside work like plumbing and electrical; Fairfax County does. But the Town signs off first, by letter, and the county’s appliance permit page says a project inside the Town needs that approval uploaded to its county record. Source.
Our Virginia Class A contractor license, 2705192276, is on the side of the van.
Choosing who installs it
Ask every company that quotes the job, us included.
If the house has a standby generator, it was sized for the system that was there when it went in. A new system’s compressor and blower draw differently, so ask the installer to check the generator’s capacity and which circuits it carries before the old one comes out.
The old size is a guess somebody made years ago. Ask whether they measure the house and check the ductwork first. Too big short cycles; too small runs all afternoon in August.
Furnace, outdoor unit, matching coil, refrigerant lines, thermostat, permit and hauling the old one away. If it isn’t on the paper, ask.
Our free second opinion looks at the system you were quoted on and tells you what it actually needs, with our price if you want it.
Two of our crew going over a work order before the day's calls.
The system we put in first
Built to take a beating. Put in by our crew.
Heat lamps, snow and rain on one outdoor unit: that’s Trane’s own film. We’re a Trane Comfort Specialist, on Trane’s own dealer locator, and when you pick a Trane, our crew puts it in.
Films: Trane’s own.
From our Google reviews
5.0 stars across 1,132 reviews. Read them on our reviews page.
Oscar and Ndung installed my HVAC system nice properly clean and they did a good job. I recommend swiftpro (Oscar and Ndung) to my friends and neighbors.
Where we work
Next door to Clifton: Fairfax Station, Burke, Manassas, Centreville and Fairfax.
Questions
If it’s running well, it can. An air conditioner from 2015 most likely runs on R-410A, which can still be serviced, and a furnace can be replaced on its own at $4,285 to $14,040. Check that the coil on the furnace came with the newer air conditioner before you decide.
$8,898 to $23,000 installed for the pair, by size and efficiency. A furnace alone, keeping your AC, is $4,285 to $14,040. The HVAC replacement estimator gives your house its own number.
No. If the AC is young and only the furnace failed, replace the furnace. If they’re the same age, do both: a new outdoor unit needs a matched coil, and one built for the old refrigerant isn’t rated for the new one.
Ready when you are
Call, send the form at the top, or take the HVAC replacement estimator first. We measure before we quote, and if a repair makes more sense than a new system, 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 Clifton and the rest of Northern Virginia. Virginia contractor license #2705192276. 5.0 stars across 1,132 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.