On a gas street
Vienna, McLean, Centreville and Annandale are mostly gas. The fall calls there are flame sensors, igniters and clogged condensate drains, and a furnace from the 1990s is living on borrowed time.
Fairfax County heating
Furnace and heat pump repair
in Fairfax County.
No heat, a furnace that keeps shutting itself off, or one on its last winter. The repair prices are right here on the page, and whoever picks up at our Chantilly shop will tell you honestly when we can get there.
Get your price in writing
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Rather talk now? (703) 997-9757
- Virginia Class A contractor, license 2705192276
- Trane Comfort Specialist
5.0 stars across 1,132 reviews
Two of our technicians at a customer’s gas furnace and water heater.
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 heats a Fairfax County house
Gas furnace or heat pump? In Fairfax County, it depends on the street.
Across the county, 61 percent of owner-occupied homes heat with gas and 35 percent with electricity, which here mostly means a heat pump. Town by town, the split swings much further than that.
- 61%of owner-occupied homes in Fairfax County heat with gasCensus, table B25117
- 35%heat with electricity, mostly heat pumpsCensus, table B25117
- 1981is the year the median owner-occupied home was builtCensus, table B25037
- 17°Fis the outdoor temperature Fairfax County tells builders to design heat forFairfax County design criteria
How owner-occupied homes heat, town by town
| Town | Gas or electric | Median home built |
|---|---|---|
| Vienna | 80% gas · 17% electric | 1972 |
| Centreville | 73% gas · 25% electric | 1990 |
| Annandale | 72% gas · 24% electric | 1967 |
| Dunn Loring | 68% gas · 28% electric | 1991 |
| McLean | 66% gas · 31% electric | 1978 |
| Lorton | 60% gas · 34% electric | 1997 |
| Fairfax Station | 58% gas · 33% electric | 1988 |
| Springfield | 58% gas · 40% electric | 1968 |
| Reston | 54% gas · 44% electric | 1981 |
| Chantilly | 53% gas · 44% electric | 1987 |
| Oakton | 48% gas · 42% electric | 1984 |
| Burke | 48% gas · 51% electric | 1979 |
| Great Falls | 46% gas · 39% electric | 1986 |
| Herndon | 37% gas · 61% electric | 1981 |
U.S. Census Bureau, American Community Survey 2020 to 2024 five-year estimates, owner-occupied homes. Electric counts heat pumps and electric baseboard together; the small rest is oil and propane. The table uses Census places, so Fairfax, Falls Church and Alexandria addresses, which cross city and county lines, are left out.
On an electric street
Herndon and Burke lean electric, and Chantilly and Reston are close to half and half. A heat pump keeps electric heat strips behind it for the coldest hours. When the heat pump falls behind, the strips quietly carry the house, and you find out on the bill.
How old the house is
One in four owner-occupied homes in the county went up in the 1980s, and nearly half before 1980. The median Annandale home was built in 1967, the median Centreville home in 1990. The furnace has been replaced since, but the ductwork usually hasn’t, which is why we size a new system to the house instead of copying the old nameplate.
What it costs
Furnace and heat pump repair prices
Our prices, the same in Great Falls as in Lorton. The diagnostic visit is $99, and you get the exact price in writing before any work starts.
Heating repairs
- Flame sensor cleaned$95 to $180
- Condensate drain cleared, trap and switch added$175 to $420
- Run capacitor replaced$240 to $370
- Igniter or flame sensor replaced$240 to $410
- Contactor replaced$290 to $425
- Blower wheel pulled and cleaned$300 to $440
- Thermostat replaced$300 to $640
- Defrost board replaced$450 to $1,150
- Control board replaced$550 to $1,180
- Blower motor replaced$670 to $2,400
An inducer motor, gas valve or heat exchanger is quoted after we look at it.
A new system, installed
- A gas furnace alone$4,285 to $14,040or $71/mo at 0% APR for 60 months
- A heat pump system$8,499 to $21,650or $142/mo at 0% APR for 60 months
- Furnace and AC together$8,898 to $23,000or $148/mo at 0% APR for 60 months
- Ductless mini-split, one zone$7,000 to $10,000or $117/mo at 0% APR for 60 months
By size and efficiency, straight from our price estimator.
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
$71/mo60mo @ 0% APR
Price range
$4,285-$23,000
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
Clean Heat. Through December 31, 2026, the heating check is $67 for a furnace or a heat pump, or $229 with the blower wheel pulled and cleaned. See the Clean Heat offer
Comfort+. On the Comfort+ membership, $199 a year, any service is 15 percent off and a heating maintenance visit comes every fall. How the membership works
Gas, electric, or both
Heat pump or gas furnace? Start with who sends your bills.
Fairfax County says most homes get gas from Washington Gas, with parts of Chantilly and Herndon on Columbia Gas of Virginia. Electricity is Dominion Energy for most of the county, and NOVEC in parts of Centreville and Clifton. Fairfax County’s list
Four temperatures that decide it
- 38°FGas becomes the cheaper heat in a Dominion Energy house on Washington Gas
- 25°FThe average January low at Dulles, 1991 to 2020
- 17°FFairfax County’s winter design temperature
- 16°FGas becomes the cheaper heat for a NOVEC member
The switch points are for a variable-speed heat pump paired with a 95 percent gas furnace. With gas at the street, a dual fuel system runs the heat pump most of the winter and lets gas take the nights below the switch. In an all-electric house, a cold-climate heat pump sized for the county’s 17 degrees carries the house with little help from its heat strips.
A Trane heat pump on one of our jobs, running through the snow.
The county’s rules
What Fairfax County asks for when a furnace or heat pump is replaced
Worth knowing before anyone hands you a quote. Every line links to the county or the state.
Permits
Replacing a gas furnace, boiler or water heater takes a county permit, even like for like, plus a chimney vent certification. Source
Replacing a heating or cooling system is mechanical permit work. Source
A heat pump or air conditioner on the newer A2L refrigerants needs an A2L refrigeration system certification with the permit. Source
Inside the City of Fairfax, the city’s own permit office issues it. A Fairfax mailing address outside the city line goes through the county. Source
If the heat is out and the furnace has to go now, Virginia lets the work start first, with the permit application in by the end of the next working day. Source
Fairfax County Fire and Rescue says
Have the heating system cleaned and checked by a professional every year. Source
Keep anything that burns at least three feet from the furnace and the water heater. Source
Put a carbon monoxide alarm on every floor. If it sounds, get everyone out and call 911 from a neighbor’s house. Source
The license is on every van: Virginia Class A, 2705192276.
What we do
Every kind of heating job, every brand
Heating work order
- Furnace repair. Gas and propane furnaces. The fault found, the price in writing, most parts on the van. Repair prices
- Heat pump repair. Iced coils, defrost boards, reversing valves, and backup heat that won’t shut off. Heat pump repair costs
- Heating tune-ups. One furnace or heat pump checked before the first cold night, safeties and all. See Clean Heat
- Furnace replacement. Sized to your house, with the installed price in writing before you decide. What a new furnace costs
- Heat pumps and dual fuel. Cold-climate heat pumps, and heat pump plus gas furnace pairs set to switch at the right temperature. The dual fuel guide
- Ductless mini-splits. Heat for the room the ducts never reached: an addition, a finished basement, a bonus room. Price one
- Boilers. Gas boiler repair and replacement, including the older hot-water systems in condos and townhouses. Boiler costs
- Thermostats and humidifiers. Smart thermostats set up for the system they run, and whole-home humidifiers for dry winter air. Air quality options
The brands
We put Trane first: a lineup from the 96 Single-Stage furnace up to the 96 Modulating Variable Speed at up to 97.3% AFUE, and the 20 TruComfort heat pump for cold nights. Trane has approved us as a Trane Comfort Specialist, so you can find us on Trane’s own dealer locator.
We also install Carrier (we’re Carrier experts), Rheem (as a Rheem Pro Partner) and Mitsubishi Electric ductless (as a Diamond Contractor), and we repair Lennox, Goodman, Amana, Daikin, York, Bryant, Ruud and the rest.
One of our technicians with a Trane outdoor unit he just installed.
The system we put in first
Built to take a beating. Put in by our crew.
Heat lamps, snow and rain on one outdoor unit: that’s Trane’s own film. We’re a Trane Comfort Specialist, on Trane’s own dealer locator, and when you pick a Trane, our crew puts it in.
Films: Trane’s own.
Customer words
What heating customers say
My 20-year-old furnace in my townhouse decided to break down during the record-breaking cold of December 2022. It was the coldest Christmas week in Northern Virginia history, and Moises and Oscar drove through terrible rush hour traffic to get my unit working again ASAP, saving both Christmas and possibly my life (seriously -it was really cold!). My wife and kids were incredibly grateful.…
Furnace repair, Christmas week 2022
Absolutely above and beyond! Tyler, Efrain and his team worked weekend hours to fix my heating system on a Saturday when other companies told us to wait until Monday. Within hours, they found a part to remove and replace the faulty one. Their value and cost was reasonable as well!…
Heating repair on a Saturday
Excellent work done honestly and efficiently. Efrain the technician was great. Was able to diagnose the problem quickly and get my older Amana gas furnace system working again.
Older gas furnace, repaired
We just had an Amana variable speed, dual fuel heat pump / gas furnace installed. Oscar, Felix, and Elijah did a great job with installation. No issues, they answered my questions, got me set up with the thermostat app, and the system was running fine (and quietly!) right away.…
Dual fuel install
I used SwiftPro in April 2025 to replace a gas furnace and a traditional A/C unit with a heat pump. It was a really, really good experience from first to last. … Their prices were reasonable (again, I compared six vendors – I made sure!), and I would gladly recommend them to anyone in the greater Fairfax/Alexandria area without reservation.…
Gas furnace and AC to a heat pump
I will definitely call on these folks again! Our heat pump was nearly failing, and Indira was able to send a technician out the same day. She also kept in touch to ensure the technician was on his way and to check on the status of the service. Our technician, Moises Rojas, was not only professional but also courteous and extremely knowledgeable. He quickly identified the issue and presented us with options. I didn’t feel pressured to buy anything beyond what was offered. Wish I had found this company sooner!
Heat pump repair
Reviews are shown as customers wrote them on Google; where one is shortened, you’ll see the cut. SwiftPro does not write, edit, buy or remove customer reviews, and offers no incentive in exchange for one.
Where we work
Every town in Fairfax County, and the two cities inside it
Our shop is in Chantilly, inside the county. Tap your town for its furnace repair page, or for its notes on our Fairfax County page.
Furnace repair page
AlexandriaAnnandaleBurkeCentrevilleChantillyCliftonDunn LoringFairfaxFairfax StationFalls ChurchFort BelvoirGreat FallsHerndonLortonMcLeanOaktonRestonSpringfieldVienna
We work in the City of Fairfax and the City of Falls Church too. Their permits come from the city, not the county.
Part of the SwiftPro crew, outside the Chantilly shop.
Questions
Fairfax County heating, answered
How much does furnace repair cost in Fairfax County?
Most of the heating repairs we run land between $95 and $1,180. A flame sensor cleaning is $95 to $180, an igniter $240 to $410, a control board $550 to $1,180, and a blower motor $670 to $2,400. The diagnostic visit is $99, and the exact price is in writing before any work starts.
Do I need a permit to replace a furnace in Fairfax County?
Yes. Fairfax County requires a permit to replace any gas appliance, even like for like, with a chimney vent certification. Replacing a heating or cooling system is mechanical permit work, and a heat pump on the newer A2L refrigerants needs an A2L certification with the permit. Inside the City of Fairfax, the city issues the permit instead of the county. Sources: Fairfax County permit library, City of Fairfax.
Is a heat pump or a gas furnace cheaper to run in Fairfax County?
With gas at the street, usually both together. A dual fuel system runs the heat pump most of the winter and switches to gas when it gets cold enough: below about 38 degrees in a Dominion Energy house, and below about 16 for a NOVEC member, with a variable-speed heat pump and a 95 percent furnace. In an all-electric house, a cold-climate heat pump sized for the county’s 17 degree design temperature does the job. Sources: Our dual fuel guide.
Who is my gas company in Fairfax County?
Washington Gas, for most of the county. Fairfax County notes that parts of Chantilly and Herndon get gas from Columbia Gas of Virginia instead. It changes the dual fuel math a little, and it decides which furnace rebate you can apply for. Sources: Fairfax County utilities list.
Are there rebates on a new furnace or heat pump right now?
Some, through the utilities, as of October 2026. Washington Gas pays $500 on a 95.1 to 96.9 percent furnace and $700 at 97 percent or higher, and $1,400 to $2,000 for a dual fuel heat pump that replaces a central air conditioner, when a contractor in its network does the work. Columbia Gas pays up to $500 on a 90 percent or better furnace installed in 2026. The federal 25C tax credit ended on December 31, 2025, and Virginia’s HEAR and HOMES rebates have no start date yet. Sources: Washington Gas, Columbia Gas, IRS, Virginia Energy.
How soon can you get to me?
Often same-day, and we will tell you honestly when we can get there. If the house is cold now, call (703) 997-9757 rather than booking online, because a phone call puts you on the dispatch board instead of the next open slot.
How often should a furnace be serviced?
Once a year, before the first cold night. Fairfax County Fire and Rescue says the same. Through December 31, 2026 our heating check is $67 for a furnace or a heat pump. Sources: Fairfax County Fire and Rescue.
How do I know it’s time to replace my furnace?
A gas furnace that gets looked at every fall usually lasts fifteen to twenty years, and a heat pump twelve to fifteen, because it runs in every season. Past fifteen, when a repair costs more than about a third of a new system, replacing it usually makes more sense. We’ll give you both prices and you decide.
What do I do if my carbon monoxide alarm goes off?
Get everyone out of the house and call 911 from a neighbor’s. Once the fire department has made it safe, call us and we’ll check the furnace, its venting and the water heater before anything runs again. Sources: Fairfax County Fire and Rescue.
Which towns do you cover in Fairfax County?
All of them: Alexandria, Annandale, Burke, Centreville, Chantilly, Clifton, Dunn Loring, Fairfax, Fairfax Station, Falls Church, Fort Belvoir, Great Falls, Herndon, Lorton, McLean, Oakton, Reston, Springfield and Vienna, plus the City of Fairfax and the City of Falls Church.
Cold house? Call (703) 997-9757.
Or book a time online. Weighing a new system instead? The estimator prices one for your house in about two minutes.
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