The condenser is younger than the furnace
Check both labels. A 1980s or 90s Reston house may well have an early 2000s furnace under a newer outdoor unit. That’s the case for replacing the furnace alone, matched to cooling you already paid for.
Reston, Virginia
Furnace replacement in Reston.
Swapping just the furnace in Reston runs $4,285 to $14,040 installed, your AC left in place. About seven in ten owners in 20190 heat with gas.
$71/mo60mo @ 0% APR
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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- Installed price in writing
- Sized to the house, not the old nameplate
- Dedicated HVAC team
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
What a new furnace costs in Reston.
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 Reston
A Reston furnace swap stays indoors, unless the new vent has to go out a wall.
Reston heats close to half and half, but the gas half isn’t spread evenly. About seven in ten owners in 20190, from Lake Anne to Reston Town Center, burn gas, and about two in three in North Point’s 20194. Around Hunters Woods and South Lakes in 20191 it’s about four in ten, since heat pumps lead there. Propane turns up in about one owner home in a hundred, and we replace those furnaces too.
More than eight in ten 20194 homes went up in the 1980s and 1990s, and Great Falls Crossing, about 500 owner homes with 20194 mail, is mostly single-family houses from around 1993, about eight in ten on gas. A builder’s furnace from those years has usually been replaced once, often in the 2000s, so the second one may be nearing twenty itself.
Keep the air conditioner when it’s the younger half. An outdoor unit often quits first, so plenty of these houses pair an older furnace with a newer condenser. Read its label: anything built from 2010 on runs a refrigerant other than R-22, and a sound one is worth keeping, with the new furnace matched to the coil already there. If it still says R-22, set the furnace and AC price, $8,898 to $23,000, beside this one.
The furnace lives inside, and Reston Association’s design review covers the outside, so a straight swap is between you, us and Fairfax County. The vent can change that. A high-efficiency furnace exhausts through plastic pipe, and in a cluster townhouse the nearest way out may be a side wall, an exterior change RA wants approved unless a guideline or your cluster’s standards cover it. A furnace that keeps the existing metal flue changes nothing outside.
Neighborhood by neighborhood
The furnaces across Reston, place by place.
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 |
|---|---|---|---|---|
| Reston | 1981 | condo and apartment buildings, about 4 in 10 | gas, about 5 in 10 | 1980s and 90s houses, many on their second furnace. |
| Great Falls Crossing | 1993 | single-family houses, about 9 in 10 | gas, about 8 in 10 | 1980s and 90s houses, many on their second furnace. |
By the numbers
Reston houses, by the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
When it’s time
When a new furnace makes sense in Reston.
The heat exchanger is cracked
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.
It’s fifteen or older and acting it
Fifteen to twenty years is a gas furnace’s usual run. Past that, parts get harder to find and each repair buys less time.
Permits, locally
Who signs off on a new furnace in Reston.
Fairfax County
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.
Our Virginia Class A contractor license, 2705192276, is on the side of the van.
Choosing who installs it
How to pick the best furnace replacement company in Reston.
Questions to ask anybody who quotes you, us included.
Did they say where the new furnace vents?
In a Reston townhouse that decides whether RA sees an application. Ask whether the quote keeps the old flue or adds pipe through a wall or the roof, and get the exit point in writing.
Did they size it to your house?
Ask how they picked the size. Copying the old nameplate repeats whatever was guessed when the house was built.
Did they check the air conditioner you’re keeping?
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.
Will they tell you if it’s worth fixing?
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
What our customers say.
5.0 stars across 1,132 reviews. Read them on our reviews page.
Moises and Oscar did a superlative job doing a custom installation of a new HVAC unit in a tight basement space. And they then took the time to go over system operation. Top tier job and service in all respects!
Where we work
Furnace replacement in every Northern Virginia town we serve
Next door to Reston: Herndon, Great Falls, Oakton, Vienna and Sterling.
Fairfax County
Arlington County
Loudoun County
Prince William County
Fauquier County
Stafford County
Questions
Furnace replacement questions from Reston.
Does a new furnace in Reston need Reston Association approval?
Not the furnace itself; RA reviews the outside, so it only comes in if the vent changes. Its flue guideline lets a metal rooftop flue skip the application if it meets a short list: least visible roof plane, no higher than code requires, painted black or the roof color. Plastic pipe through a wall isn’t covered, so ask your cluster or RA first.
Who owns the furnace in a Reston condo?
Usually you do, while the building may own the flue, the gas piping or the roof the vent crosses. More than half of 20190’s homes are in condo and apartment buildings, so it matters most there. Check your condo documents first; the new furnace has to fit the same closet unless the association agrees to a change.
How much does a new furnace cost in Reston?
$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.
Should I repair it or replace it?
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
The range first, then your number.
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 Reston 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.