Open 24/7 for emergencies
Furnace repair in Dunn Loring starts with a $99 diagnostic visit, and a flame sensor cleaned is $95 to $180, priced in writing before 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 Dunn Loring
Vienna’s cooperative weather station, 3.6 miles west, keeps the closest long-term record: a January low averaging 23 degrees, about 99 nights a year at freezing or colder, and close to 4,900 heating degree days, five times its cooling degree days. In half of all years the first freeze comes by October 29 and the last not until April 14, and about four nights a year reach 10 or lower.
About two thirds of 22027’s owner homes heat with natural gas. The typical house went up in 1991, and the furnace usually sits in the basement. Most of today’s furnaces light with a hot surface igniter, $240 to $410 to replace. The high-efficiency kind vents out a side wall through two plastic pipes and drains water as it burns, and a slow drain shuts it down on the coldest night it can find.
Close to three in ten heat with electricity, usually a heat pump with electric strips as backup. On the few nights Vienna’s record puts at 10 or below, the strips carrying the load is normal; strips running through a 40-degree afternoon mean the heat pump has quit pulling its weight. A couple of homes in a hundred burn propane, and we repair those furnaces too, with the gas pressure set for propane.
Fairfax County got 20 to 28 inches of snow in February 2010, with outages countywide from snow-loaded trees and lines, and 23 to 31 inches in the January 2016 blizzard. Snow drifting over a high-efficiency furnace’s two pipes trips a safety switch and puts the burners out, so after a big storm, clear them before you shovel out the car. A power cut stops a gas furnace too, since the igniter, inducer and blower run on electricity. If the heat doesn’t come back with the lights, call us, and we’ll check the furnace, its vent pipes and its controls.
By the numbers
From the Census Bureau’s 2020 to 2024 survey. Median year built and heat count owner-occupied homes only.
ZIP 22027 as a whole: every Dunn Loring address. The Dunn Loring Census place is bigger: about three in four of its homes have Vienna mail.
What you’d notice
Late January 2026 brought Extreme Cold Warnings on three nights and wind chills to 10 below across the Piedmont. A week of nearly nonstop running finds whatever was tired: an inducer motor, a pressure switch, a blower motor running hot, $670 to $2,400 if it’s done. One that came back after a reset still deserves a look.
The burners fire and go out a few seconds later, over and over. That’s usually a dirty flame sensor, and cleaning it takes about ten minutes.
No glow, no flame. A cracked igniter is the usual part, and on a high-efficiency furnace a clogged condensate line can stop it cold too.
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.
Ask whether the tech tests the electric strips and what brings them on. Working strips can hide a heat pump that has quit; watching the outdoor unit run in heat mode tells the difference.
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.
Technician Steven came out to look at our heat that was not working properly. He was extremely pleasant and knowledgeable. He went out of his way to explain the issue and our options for the repair. We felt like we were in good hands. Great customer service.
Where we work
Next door to Dunn Loring: Vienna, Falls Church, McLean, Annandale and Oakton.
Questions
A repair doesn’t. Replacing a gas or propane furnace takes a Fairfax County permit, even like for like, and a chimney vent certification, Vienna mail or not.
If it’s the original, it’s past the fifteen to twenty years most gas furnaces run. Fix a flame sensor or an igniter; before a big motor or a heat exchanger, price a furnace alone at $4,285 to $14,040 installed.
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 Dunn Loring 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.