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A new furnace and AC in Fairfax Station runs $8,898 to $23,000 installed, per system. Bigger houses may have two; the estimator quiz prices one at a time.
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 Fairfax Station
Eight in ten homes in 22039 were built from 1980 through 1999, and very few still run the furnace and air conditioner they started with. Where the second pair went in together, say during the 2000s, both halves are now near twenty years old or past it, and two pieces installed the same week tend to give out within a few seasons of each other. When one quits, price both.
South Run and Crosspointe show it plainly. In the South Run Census place, 94 percent of homes date from those two decades and nearly 9 in 10 owners heat with gas. Crosspointe came a little later, with a median owner home from 1993, and about three quarters of its owners heat with gas. There, replacing the system usually means a new gas furnace inside and a new condenser out back, matched and sized to the house as it stands now.
Size is the other question. With four or more bedrooms in about 9 in 10 houses, plenty carry two complete systems, the second cooling the bedrooms from the attic. Tell the estimator quiz the house is over 3,000 square feet and it says so plainly: you may need two systems, and its number is for one.
On the big lots the pair may not be gas at all. In the two Census tracts that hold most of Fairfax Station’s septic lots, electricity heats as many owner homes as gas, about 4 in 10 each. In an all-electric house the matching replacement is a heat pump and air handler, $8,499 to $21,650 installed, and in a propane house it’s a furnace converted for propane under a new air conditioner.
Neighborhood by neighborhood
Census figures for the owner-occupied homes in each place, and what that usually means for a replacement.
| Place | Median home built | Most homes are | Heated with | What the system usually is |
|---|---|---|---|---|
| Fairfax Station | 1982 | single-family houses, about 9 in 10 | gas, about 5 in 10 | 1980s and 90s houses, most on their second furnace and AC. |
| South Run | 1988 | single-family houses, nearly all | gas, about 9 in 10 | 1980s and 90s houses, most on their second furnace and AC. |
| Crosspointe | 1993 | single-family houses, nearly all | gas, about 8 in 10 | 1980s and 90s houses, most on their second furnace and AC. |
By the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
ZIP 22039 as a whole: every Fairfax Station address. The Fairfax Station Census place in the table also takes in streets with Fairfax mail.
When it’s time
Each condenser’s data plate shows when it was made. If the years match, the systems went in together, and the one still running is on the same clock as the one that failed. Price both now, then decide on each.
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
Fairfax County lists replacing a heating or cooling system as mechanical permit work. Source.
Fairfax County requires a permit to replace any gas appliance, even like for like: a gas water heater, furnace or boiler. Replacing a fuel-burning appliance also needs a chimney vent certification. Source.
Fairfax County asks for an A2L refrigeration system certification with the permit for any heat pump or air conditioner that runs on the newer A2L refrigerants. 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.
An attic system is priced by what it takes to get the old unit down and the new one up: the hatch, the stairs, the platform, the drain pan under it. A quote written from the driveway can’t know that. Ask whether they went up.
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.
Very professional HVAC installation, knowledgeable technicians, clean work,respectful of property, punctual, conscientious.
Where we work
Next door to Fairfax Station: Burke, Clifton, Springfield, Fairfax and Annandale.
Questions
No. If one is failing and the other runs well, replacing one now and the other later is a sound plan, and each written price stands on its own. Doing both at once means one round of measuring and one install, with matching equipment upstairs and down.
Price both now. About 1 in 6 Crosspointe homes went up after 2000, and a pair from the early 2000s is past twenty years old. Price the replacement before it fails rather than after; if it’s acting up first, a repair diagnostic visit is $99.
$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 Fairfax Station 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.