Open 24/7 for emergencies
Furnace repair off post at Fort Belvoir starts with a $99 diagnostic visit; a flame sensor cleaned is $95 to $180, priced before any work.
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5.0 stars across 1,132 reviews
Two of our technicians in a Northern Virginia utility room, between the furnace and the 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 it costs
The same price book as the rest of our site. The diagnostic visit is $99, and the tech prices the repair before starting it.
Flame sensor cleaned
$95 to $180
Igniter or flame sensor replaced
$240 to $410
Blower wheel pulled and cleaned
$300 to $440
Thermostat replaced
$300 to $640
Control board
$550 to $1,180
Blower motor
$670 to $2,400
Repair diagnostic visit
$99
Often same-day, and we will tell you honestly when we can get there.
With Comfort+ membership, $20 a month or $199 a year, the diagnostic visit is included, any service is 15% off, and a heating maintenance visit comes every fall.
What’s different in Fort Belvoir
Winter on this stretch of the Potomac is short on paper. Reagan National Airport, about 13 miles up the river, averages a January low near 30 and about 60 freezing nights a year, with the median first freeze on November 18 and the last on March 24. The cold snaps are what catch a furnace out: an Arctic front on December 23 and 24, 2022 dropped wind chills to around 5 below near the tidal Potomac, and late January 2026 brought over a week of Arctic air, with Extreme Cold Warnings on the 27th, 30th and 31st.
Off post, most houses are Cook Inlet’s 256, and Fairfax County’s parcel records show every one with gas connected and a full basement, almost all built from 2002 through 2004: a gas furnace downstairs, often the builder’s. After twenty-some winters, a long cold run takes out what lights and proves the flame: an igniter, $240 to $410 replaced, or a flame sensor glazed until the burners light and drop out, cleaned for $95 to $180.
If your furnace vents through two white plastic pipes in a wall, watch them after a snow. The January 2016 blizzard left 23 to 31 inches across Fairfax County, and a drift over those pipes shuts a high-efficiency furnace down with nothing broken. Clear both and reset the thermostat.
Accotink is different. The county shows no gas available to nearly every Backlick Road lot, so the systems we repair there are heat pumps and propane furnaces. In a winter this mild a heat pump carries most of the load, and its backup strips should only kick in during a real cold snap; strips running all day mean it isn’t keeping up. On post, family housing heat, central or geothermal, is The Villages at Belvoir’s to maintain, so residents call its maintenance team, not us.
What you’d notice
On a high-efficiency furnace that’s often the intake or exhaust pipe outside, packed with snow. Clear both pipes and try again. If it locks out with the pipes clear, the $99 diagnostic visit finds out why.
Dust burning off the heat exchanger smells for the first few minutes of the season, then stops. A gas smell is different: leave the house and call your gas company from outside.
Short cycling is usually a clogged filter, a thermostat in a bad spot, or a furnace too big for the house. The filter is the one to check yourself first.
Safety and paperwork
Fairfax County Fire and Rescue says to have the heating system cleaned and checked by a professional every year, and to keep anything that burns at least three feet from the furnace and the water heater. Source.
Fairfax County Fire and Rescue names a faulty gas furnace or water heater as a carbon monoxide source, says to have gas appliances inspected every fall, and to put a CO alarm on every floor. Source.
Our Virginia Class A contractor license, 2705192276, is on the side of the van.
Choosing who fixes it
Questions worth asking anybody who comes out, us included.
In a mild winter the heat pump does nearly all the heating, so worn backup strips can hide for years until a night like December 23, 2022. Ask the tech to switch on the backup heat and measure what it draws, not only look at the outdoor unit.
Flame sensors, igniters and control boards all have a going rate. A tech who can’t tell you the number before starting is asking you to find out afterwards.
Getting the burners lit is half a heating call. Ask whether they check the flue and test for carbon monoxide while the panel’s open.
A big repair on a furnace past 15 or 20 years deserves a replacement price next to it. A good tech puts both numbers in front of you and lets you choose.
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.
We had a mini split ac/heat unit installed. They were here when they said they would be, were very professional, and did a very nice job.
Where we work
Next door to Fort Belvoir: Lorton, Springfield, Alexandria, Woodbridge and Fairfax Station.
Questions
No. The Villages at Belvoir owns and maintains on-post family housing; a no-heat problem there goes in as a service request through its resident portal. We repair heat in the off-post 22060 houses.
Usually, for the small parts: a flame sensor or igniter on a sound furnace is money well spent. Before a big repair on a furnace past twenty, a blower motor at $670 to $2,400 or a cracked heat exchanger, check the replacement range in our HVAC estimator.
The diagnostic visit is $99. A flame sensor cleaned is $95 to $180; an igniter or flame sensor replaced, $240 to $410; a control board, $550 to $1,180; a blower motor, $670 to $2,400.
Fix the small parts on almost anything. Before a big repair on an old furnace, look at the replacement number: a furnace alone, keeping the air conditioner you have, runs $4,285 to $14,040 installed, and the HVAC estimator gives your number in about a minute. From about $71 a month at 0% APR for 60 months, the whole price financed, on approved credit.
Ready when you are
Call, or send the form at the top. The tech prices the repair from the book before starting, and if the furnace is at the end of its life 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 Fort Belvoir 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.