Open 24/7 for emergencies
A furnace alone in Vienna runs $4,285 to $14,040 installed, and the air conditioner you have stays. Gas heats about eight in ten Town of Vienna owner homes.
Price range
$4,285-$14,040
8yrs @ 7.99%
$61/mo
15yrs @ 9.99%
$46/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
Two of our heating technicians beside a gas furnace, the cooling coil on top of it and the water heater to the right.
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 gas furnace on its own, 2 to 5 tons, keeping the air conditioner you have. A single-stage furnace in a small house sits near the bottom; a modulating one in a big house, near the top.
A gas furnace alone, keeping your air conditioner, installed
$4,285 to $14,040
or $71/mo at 0% APR for 60 months
A furnace and air conditioner together, installed
$8,898 to $23,000
or $148/mo at 0% APR for 60 months
Repair 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, at no charge, before anything is ordered.
Natural gas or propane, in a house, a townhouse or a condo, we replace them all. Oil furnaces we don’t.
What’s different in Vienna
Gas is how Vienna keeps warm: about eight in ten owner homes inside the Town and three in four in Wolf Trap, from Washington Gas, the company Fairfax County names for most of its residents. Propane is rare here, about one owner home in a hundred, and we replace those furnaces too. Which part of Vienna the house sits in shapes most of the rest.
In the Town’s older houses, about two thirds built before 1980, the furnace usually sits in the basement beside the gas water heater, both on one masonry chimney. That chimney is where the 80 or 95 percent choice gets made. An 80 percent furnace can stay on it; a 95 percent one needs a wall to vent through and a drain for the water it makes. Fairfax County asks for a chimney vent certification with any fuel-burning appliance replacement, so the chimney gets looked at either way, and Washington Gas pays its Virginia furnace rebate only from 95.1 percent up.
About a quarter of the Town’s homes went up after 2000, many of them rebuilds. Those usually split the heat between a basement furnace for the main floors and an attic one for the bedrooms, and the two rarely fail the same winter, so replace the one that’s failing. The attic one goes up through the same hatch or pull-down stairs, and that opening shapes the price too.
Keeping the air conditioner takes three checks first: the refrigerant on the outdoor unit’s label (R-22 means it predates 2010 and is near its own end), whether the coil on the furnace matches the new cabinet’s width, and the blower setting for that air conditioner’s size. In Windover Heights, the historic district in northwest Vienna, a new vent pipe on a wall the street can see is an exterior change, so ask about the Board of Review before choosing a high-efficiency furnace.
Neighborhood by neighborhood
Census figures for the owner-occupied homes in each place, and what that usually means for the furnace that’s there now.
| Place | Median home built | Most homes are | Heated with | The furnace there now |
|---|---|---|---|---|
| Wolf Trap | 1980 | single-family houses, nearly all | gas, about 7 in 10 | 1980s and 90s houses, many on their second furnace. |
| Vienna | 1972 | single-family houses, about 8 in 10 | gas, about 8 in 10 | Gas furnaces on their second or third round, often on a chimney shared with the water heater. |
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
Wolf Trap is almost all single-family houses, the typical one from 1980, and about a third went up in the 1980s and 90s, so plenty are on a second furnace. If the outdoor unit was replaced in the last ten years and its label says R-410A, a furnace on its own is usually the better buy.
A high-efficiency furnace vents out the side in plastic pipe, which can leave the water heater alone in a chimney sized for two. Ask about that before you pick a furnace, not on install day.
It’s the wall that keeps the burner’s exhaust out of the air the furnace blows through the house. Nobody patches one; a crack ends the repair conversation.
Permits, locally
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.
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.
A Vienna mailing address doesn’t settle it. Inside the Town, the county permit needs the Town’s approval uploaded with it, and in Windover Heights a change the street can see adds the Board of Review. Ask before the install date is set.
Ask how they picked the size. Copying the old nameplate repeats whatever was guessed when the house was built.
A new furnace has to work with the coil and the outdoor unit already there. Ask whether they looked at both before quoting a furnace on its own.
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 1,132 reviews. Read them on our reviews page.
Moises showed up on time and was very thorough and quick. He diagnosed our problem and Tyler came in and gave us a great quote on a new unit. They came back and installed it the next day! They came through for us and I am very happy with their service. Will definitely use them again!
Where we work
Next door to Vienna: Dunn Loring, Oakton, McLean, Fairfax and Reston.
Questions
Yes, and with a younger air conditioner that’s usually right. The furnace alone runs $4,285 to $14,040 installed; the new cabinet has to line up with the coil that sits on it, and the blower is set for that air conditioner. The HVAC replacement cost estimator narrows the range for your house.
$4,285 to $14,040 installed for a gas furnace on its own, keeping the air conditioner you have; size and efficiency set where yours lands. A furnace and air conditioner together run $8,898 to $23,000. The HVAC replacement cost estimator gives your house its own number.
Fix the small parts on almost any furnace. Past fifteen years, with a repair over a third of the price of a new one, replacing usually wins. Not sure which you’re looking at? The diagnostic visit is $99, and the tech prices the repair before starting it.
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 furnace 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 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.