Furnace and AC replacement in Vienna.
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.
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- Sized to the house, not the old label
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Get your new system priced
Vienna was built twice, before 1980 and after 2000, and both rounds of systems are due.
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.
The systems across Vienna, place by place.
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. |
Vienna houses, by the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
The Town of Vienna
Nearly the whole town sits in 22180, which it shares with county streets toward Dunn Loring and Merrifield.
- Median home built1972 Census
- Built before 1980about 7 in 10 Census
- Built since 2000about 3 in 10 Census
- Most homes aresingle-family houses, about 8 in 10 Census
- Heated withgas, about 8 in 10 Census
- Rentedabout 2 in 10 Census
- Houses this age are usually on their second or third system, often on the original ductwork.
- Most homes here heat with gas, so the usual pair is a gas furnace inside and an air conditioner outside, with the coil sitting on the furnace.
The county side, around Wolf Trap
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.
What a new furnace and AC costs in Vienna.
$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
- Furnace alone, keeping your AC$4,285 to $14,040
- Heat pump system instead$8,499 to $21,650
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.
When replacing both makes sense in Vienna.
The builder’s pair in a 2000s Vienna rebuild
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.
Third system, original ducts
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.
The AC died and the furnace is the same age
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.
Who signs off on a new system in Vienna.
Town of Vienna
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.
How to pick who replaces your furnace and AC in Vienna.
Ask every company that quotes the job, us included.
Did they measure the ducts in a house older than 1960?
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.
Do they size it to the house, or copy the old label?
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.
Is the whole job in the written price?
Furnace, outdoor unit, matching coil, refrigerant lines, thermostat, permit and hauling the old one away. If it isn’t on the paper, ask.
Already holding another company’s quote?
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.
What our customers say.
Hard working crew that removed old system and installed new system in a professional manner.
5.0 stars across 884 Google reviews. Read them on our reviews page.
Furnace and AC replacement questions from Vienna.
Should a Vienna rebuild with three systems replace them all at once?
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.
Does the Town of Vienna have to approve a new furnace and AC?
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.
How much does a new furnace and AC cost in Vienna?
$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.
Do I have to replace both at the same time?
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.
More from SwiftPro in Vienna.
More from SwiftPro in Vienna
Start with your number, then a written quote.
Call, book online, 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 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 884 Google reviews. SwiftPro maintains a dedicated HVAC team and a dedicated plumbing team.
SwiftPro Heating, Cooling & Plumbing, 4230 Lafayette Center Dr, Suite N, Chantilly, VA 20151, (703) 997-9757. Book online, read our reviews, or see every town we serve.