It’s past 15 years
Trane, Carrier and Lennox all put most furnaces at 15 to 20 years, and ENERGY STAR says to weigh a replacement once one passes 15.
Past that, put any big repair next to the price of a new one.
Furnace Installation and Replacement in Northern Virginia
A new gas furnace, installed, runs $4,285 to $14,040 in Northern Virginia, keeping the air conditioner you have. Replacing the AC with it runs $8,898 to $23,000 for both, and the HVAC estimator narrows either one to your house.
$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
Send this and the office calls or texts you back to set a time.
We’ll call or text this number about your request. By sending it you agree to our terms and privacy policy.
Rather talk now? (703) 997-9757
- Gas and propane furnaces
- 80 or 95 percent, sized to the house
- Two years of our labor included
5.0 stars across 1,131 reviews
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 Northern Virginia
Our own installed prices, the same price book as the HVAC estimator.
Gas furnace alone
$4,285 to $14,040
or $71/mo at 0% APR for 60 months
Keeping the air conditioner you have, by size and efficiency. Propane too.
Furnace and AC together
$8,898 to $23,000
or $148/mo at 0% APR for 60 months
Both halves at once, as one matched system. HVAC replacement
Heat pump system instead
$8,499 to $21,650
or $142/mo at 0% APR for 60 months
Outdoor unit and air handler, all electric or dual fuel. Heat pump replacement
Diagnostic visit
$99
If it might be a repair: the fault found, and the fix and the replacement priced side by side.
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
Want your own number before anyone comes out? The HVAC estimator prices your house in a few questions.
What moves the price. The size the house needs, the efficiency (80 or 95 percent and up), whether it runs single-stage, two-stage or variable-speed, and the venting: a 95 percent furnace that replaces an 80 needs new PVC venting and a drain. The HVAC estimator narrows it to your house, and our new furnace cost guide goes line by line.
No heat tonight? We run 24/7 emergency service. Call (703) 997-9757.
80 or 95 percent
The venting question
that moves the price
AFUE is the share of the gas that ends up as heat in the house. New gas furnaces come in two families, and the difference is in how they vent.
- An 80 percent furnace sends hot exhaust up a metal flue or the chimney, the way most older furnaces here do. Swapping one for another is the simpler job.
- A 95 percent and up furnace pulls so much heat out of the exhaust that it vents through white PVC pipe out a wall or the roof, and it makes water, so it needs a condensate drain.
- The water heater question. If a gas water heater shares the chimney with the old furnace, taking the furnace off it can leave the water heater alone in a flue sized for two. The chimney may need a liner, and we check that at the estimate.
- Washington Gas pays back $500 on a new furnace rated 95.1 to 96.9 percent AFUE and $700 at 97 percent and up, for its Virginia customers. We’re in Washington Gas’s contractor network for furnaces. Washington Gas needs the paperwork no later than 30 days after the install, and homes on Columbia Gas, parts of Chantilly and Herndon among them, don’t qualify. Their terms.
A Rheem gas furnace we installed in a Northern Virginia utility closet. The white PVC above it is the kind of venting a 95 percent furnace uses.
When it’s time
When a furnace is worth replacing,
and when it isn’t
Four things that usually decide it. A technician tells you which apply to yours.
The technician found a cracked heat exchanger
The heat exchanger keeps the flame’s exhaust out of the air you breathe. A crack is the one finding where we’ll tell you to stop running the furnace.
We show you what we found. A carbon monoxide alarm near the bedrooms is worth having either way.
Repairs every season
Lennox puts it plainly: several furnace repairs within a few years mean the furnace is failing.
Comfort+ members bank half of each repair bill toward the replacement, up to $1,500.
It cycles on and off, or never warms the house
Short cycling and cold rooms can be a part, a filter, a furnace the wrong size or the ducts.
A $99 diagnostic visit finds which before anybody prices a new furnace.
How a replacement goes
From the first look
to the system running
Often same-day, and we will tell you honestly when we can get there. We run 24/7 emergency service when the heat or the air quits, and a replacement starts the same way a repair does: somebody looks at the house.
- 1
We look at the house
Someone from our HVAC team comes out and measures: the house, the ductwork, the venting, the electrical panel, where the outdoor unit sits.
- 2
Every option, priced
Each option on paper with its installed price and its monthly payment, side by side. If a repair makes more sense, you hear that first.
- 3
Install day
The crew covers the floors and the path in, takes the old equipment out and away, and puts the new system in.
- 4
Started and explained
The system runs while the crew checks it, the thermostat gets set up with you, and two years of our labor is included. Five or ten years is an option.
Paying for it
Rebates, financing and
what to ask before you sign
- Financing, on approved credit. The monthly figures on this page are the plans our estimators use. See yours on the financing page or at the estimate.
- The federal tax credit ended for heat pumps, furnaces and air conditioners installed after 2025, so nobody should be pricing one in.
- Comfort+ membership is $199 a year. The diagnostic visit is included, and half of each repair bill is banked toward replacing that system, up to $1,500. How Comfort+ works.
- Holding someone else’s quote? Our free second opinion: a technician looks at the system you were quoted on and tells you what it actually needs.
What customers said
Furnace replacements, in our
customers’ own words
5.0 stars across 1,131 reviews. These three are about furnace replacements.
Completely satisfied with furnace replacement. Tyler was on the phone back and forth to make sure I received the service I need and he also tried to work with me to fit with my budget. … They removed the old furnace and replaced the new one. Also, they helped to install and set up new thermostat. They made sure to clean up before they left.…
…SwiftPro replaced the furnace for me quickly, just in time before the cold days. They are very quick to response, their quote is reasonable. The installation was done professionally. They thoroughly tested the system.…
…The whole crew were very skilled, efficient and friendly. They went the extra mile to insure a satisfied customer.…
Shown as written on Google, cut to the part about the job. Read them all.
Who installs it
The people who come
to your house are ours
No subcontracted install crews: the estimate, the install and any call after it are SwiftPro.
- A dedicated HVAC team. The people who install your system do heating and cooling every day. Our plumbers are a separate team, and when a job touches both trades, both are in the same company.
- On Trane’s dealer locator as a Trane Comfort Specialist, a Rheem Pro Partner, and Carrier experts.
- Virginia Class A contractor license #2705192276, fully insured, and BBB Accredited with an A rating.
- 5.0 stars across 1,131 reviews, and you can read them all.
- Family owned, out of Lafayette Center Drive in Chantilly and our office in Ashburn. About SwiftPro.
The SwiftPro team in front of our wrapped vans at the Chantilly shop.
Where we work
Furnace replacement in every
Northern Virginia town we serve
Out of Chantilly and Ashburn, across six counties. Pick your town for its furnace replacement page: the same prices, plus what’s different about the houses there.
Fairfax County
Arlington County
Loudoun County
Prince William County
Fauquier County
Stafford County
Asked at the estimate
Furnace replacement questions,
answered straight
How much does a new furnace cost in Northern Virginia?
A new gas furnace runs $4,285 to $14,040 installed, keeping your air conditioner, and a furnace and AC together $8,898 to $23,000. The size, the efficiency (80 or 95 percent and up), single-stage, two-stage or variable-speed, and the venting the job needs decide where yours lands. From about $71 a month at 0% APR for 60 months, the whole price financed, on approved credit. How financing works
How long does a furnace last?
Trane, Carrier and Lennox put most at 15 to 20 years, and the Department of Energy plans on 21. Yearly maintenance stretches it; a furnace that was oversized or ran on clogged filters wears out sooner.
Is a 95 percent furnace worth it over an 80?
Usually, when the house can take the PVC venting without a fight: more of the gas becomes heat, and Washington Gas pays $500 to $700 back on 95.1 percent and up. Where the venting run is long or awkward, or the gas bill is small, an 80 can still be the right call, and we’ll price both.
Can I replace just the furnace and keep my AC?
Yes, when the air conditioner is young and in good shape. The indoor coil sits on top of the furnace, so the new furnace has to fit it, and we check that before we quote. If the AC is about as old as the furnace, we’ll price it both ways.
Is there a rebate on a new furnace?
Washington Gas pays $500 on a furnace rated 95.1 to 96.9 percent AFUE and $700 at 97 percent and up, for its Virginia customers, with the paperwork in no later than 30 days after the install. We’re in its contractor network for furnaces. Homes on Columbia Gas don’t qualify, and the federal tax credit ended for anything installed after 2025.
What size furnace do I need?
It depends on the house, not the old furnace’s label: square footage is a start, and the insulation, windows and ductwork finish it. Our furnace sizing guide walks through it, and the estimate measures it.
Do you replace propane furnaces?
Yes, propane and natural gas furnaces both.
Ready when you are
See the range first,
then your number
Call, or send the form at the top and the office calls or texts you back to set a time. The price is in writing before anything is ordered, and if a repair makes more sense, 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
Prices are SwiftPro’s own installed prices in Northern Virginia, from the same price book as the HVAC estimator; yours is written down before anything is ordered. Rebate terms are the utilities’ and change; they’re as read in October 2026. Lifespans as the Department of Energy, ENERGY STAR and the manufacturers publish them, read in October 2026. Trane, Rheem and Carrier are trademarks of their owners.
Watch our crew swap out old furnaces
Real jobs in Northern Virginia homes, filmed by our own crew. Tap one to watch.
0:13An Old Furnace Out and a New Rheem Gas Furnace In- 0:49Rusty Furnace on a No-Heat Call, and the New One in the Snow
- 0:07Old Furnace Replacement: The Vision Is to Fill the Room Right
- 0:15Furnace Replacement Before and After: Why the Plenum Matters
- 1:49High Efficiency Furnace Venting: Mapping Where the Vent Can Go
- 1:40Furnace PVC Vent Pipes: Designing a New Layout From the Old One
