The furnace is older than the condenser out back
If the outdoor unit was replaced in the last several years and the furnace is from the 2000s, the furnace is the half running out of time. Replace it and keep the younger air conditioner.
Centreville, Virginia
Furnace replacement in Centreville.
Swapping just the furnace in a Centreville house runs $4,285 to $14,040 installed, gas or propane. The AC is often the younger half, worth keeping.
$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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Rather talk now? (703) 997-9757
- 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 Centreville.
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 Centreville
A Centreville furnace on its own, when the air conditioner is the newer half.
Roughly three in four Centreville homeowners heat with natural gas, and about one in a hundred with propane; we replace both kinds of furnace. The median owner’s house here went up in 1990, so the furnace in it now is rarely the builder’s. Gas furnaces tend to run fifteen to twenty years, which puts the one in a typical Centreville house on its second round, likely put in during the 2000s or early 2010s.
Two labels settle whether the air conditioner stays: the furnace’s and the outdoor unit’s. Condensers built after 2010 run R-410A or a newer refrigerant, so one put in during the last decade usually has summers left in it and can carry on above a new furnace. When the condenser is the furnace’s age, or still on R-22, pricing the pair makes more sense, and the price table below shows both ranges.
In the townhouses, nearly half of Centreville’s homes, the furnace usually stands in a utility room or closet on the lowest level with the cooling coil boxed on top of it and the copper lines running out to the condenser behind the house. A furnace swap keeps that coil, so the new furnace has to sit under it cleanly and move the amount of air it was built for.
On install day, look at the carbon monoxide alarm too. Fairfax County Fire and Rescue puts a plug-in alarm’s life at about ten years and wants one on every floor, so if yours came with the house or with the last furnace, check the date on the back.
By the numbers
Centreville houses, by the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
Centreville
- Median home built1990 Census
- Built before 1980about 1 in 10 Census
- Built since 2000about 2 in 10 Census
- Most homes aretownhouses, about 5 in 10 Census
- Heated withgas, about 7 in 10 Census
- Rentedabout 3 in 10 Census
- Townhouse furnaces sit in closets and attics, so the new one has to fit the same space and the same way in.
- Most heat here is gas, so the usual job is gas furnace for gas furnace, and the real choice is how efficient the new one should be.
When it’s time
When a new furnace makes sense in Centreville.
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 Centreville.
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 Centreville.
Questions to ask anybody who quotes you, us included.
Did they show you where the new vent pipes and the drain will go?
A high-efficiency furnace vents in plastic pipe through a wall or the roof, and it makes water as it runs. In a townhouse in the middle of a row, with only front and back walls to work with, ask to see the vent route and where the water goes, a floor drain or a small pump, before you sign.
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.
Aaron, Kaiden, Oscar, Derek and Felix did a great job installing an HVAC unit and cleaning out the ducts and dryer vents, which were very difficult to access! They were all very professional!
Questions
Furnace replacement questions from Centreville.
My Centreville AC is only a few years old and the furnace is failing. Do I have to replace both?
No. A younger condenser and its coil can carry on over a new gas furnace, provided the furnace’s blower is set up for the airflow that coil was rated for. The estimator quiz prices the furnace alone for your house.
Is a heat pump worth pricing instead of a new furnace?
Only if the air conditioner is due too, because a heat pump takes the AC’s place. Then it’s worth a look: Washington Gas, which supplies nearly every Centreville gas account, pays toward a heat pump installed with a new 95 percent furnace when it replaces a central air conditioner. Our dual fuel guide has the amounts and the fine print.
How much does a new furnace cost in Centreville?
$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 Centreville 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.