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Furnace and AC replacement in Vienna runs $8,898 to $23,000 installed. Most houses in the Town date from before 1980 or after 2000, and both are coming due.
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 Vienna
Inside the Town of Vienna the houses come in two waves: about two thirds went up before 1980, a quarter since 2000, and fewer than one in ten in between; the typical owner’s house dates from 1972. So a Town furnace and air conditioner tend to be either the third pair in a 1950s or 60s house, or the original pair in a rebuild now crossing twenty.
About two in ten homes in the Town predate 1960, and many were built for heat alone and got central air later, on ducts laid out for a furnace and a return smaller than cooling wants. Copying the old nameplate repeats that; sizing from the house and the duct readings fixes it. Where the furnace shares a chimney with the gas water heater, the new pair’s venting is settled before the price is final.
The rebuilds ask a different question: two or three systems in one house, often a basement furnace for the main floors and an attic system over the bedrooms. A builder usually set them the same year, so they wear out together, but each gets its own price, and the attic pair can go first.
Wolf Trap, on the county side, sits between the two waves: the typical house went up in 1980, nearly all are single-family, and about a third were built in the 1980s and 90s. A system put in there during the 1990s probably holds R-22, a refrigerant nobody has produced since 2020, so a leak in either half usually ends the repair talk. On both sides of the line, a new air conditioner on today’s A2L refrigerants needs Fairfax County’s A2L certification with the permit.
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 |
|---|---|---|---|---|
| Wolf Trap | 1980 | single-family houses, nearly all | gas, about 7 in 10 | 1980s and 90s houses, most on their second furnace and AC. |
| Vienna | 1972 | single-family houses, about 8 in 10 | gas, about 8 in 10 | Second or third systems, often on the original ductwork. |
By the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
Nearly the whole town sits in 22180, which it shares with county streets toward Dunn Loring and Merrifield.
Vienna mail outside the town line: Wolf Trap and the Tysons edge in 22182, the Oakton side of 22181, Dunn Loring. The figures are Wolf Trap’s, the biggest piece.
When it’s time
Check the date on the furnace’s sticker inside its door and on the side of the outdoor unit. In an early 2000s rebuild both usually show the same year, now past twenty. When one needs a big repair, the other is close behind.
An older house is usually on its third system, still on ductwork laid out for the first. We check the ducts and venting before sizing the new one.
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.
Permits and sign-offs
Inside the Town of Vienna, Fairfax County is the building official, so a gas water heater or furnace swap in town takes a Fairfax County permit, even like for like, and the county page adds that work in the town can need the Town’s own sign-off too. Source.
The Town of Vienna has no building official of its own: Fairfax County reviews the mechanical, plumbing and electrical work inside the town and issues the permits, and the Town’s Planning and Zoning review covers additions, decks, basement renovations and other listed work. 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 had no air conditioning when it was built, ask whether they measured the return and the longest supply runs before sizing. Oversized equipment on undersized ducts gets noisy and still leaves the far bedroom warm.
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.
Hard working crew that removed old system and installed new system in a professional manner.
Where we work
Next door to Vienna: Dunn Loring, Oakton, McLean, Fairfax and Reston.
Questions
Not necessarily. Each system gets its own written price, with how old it is and how it tested, so you can do the one that’s struggling and plan the rest. Each new pair runs $8,898 to $23,000 installed; the HVAC replacement cost estimator narrows that for your house.
Fairfax County issues the mechanical permit as the Town’s building official, and its permit pages say projects inside the town need the Town’s own approval too, uploaded to the county’s record. On the county side of a Vienna address it’s the county alone. Either way, settle it before the old system comes out.
$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 Vienna 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.