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The diagnostic visit is $99, and a flame sensor cleaned is $95 to $180 from our published price book.
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Furnace and heat pump repair in Bristow, from Victory Lakes and Braemar out to Brentsville, every repair priced from our book before work starts.
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 Bristow
In Linton Hall, the Census place that takes in about two thirds of 20136, gas heats close to nine in ten owner homes. Electricity heats about one in nine, and a little over one in a hundred burns propane. The median home there was built in 2004, so the gas furnace on a typical Bristow call either came with the house or replaced the one that did, and both of those are old enough now to have a history worth asking about.
How it vents matters. A lot of builder furnaces from those years were 80 percent efficiency models that sent their exhaust up a metal flue shared with the gas water heater. Swap one for a high-efficiency furnace, which vents through plastic pipe out a side wall, and the water heater is left alone on a flue sized for two appliances, which can be too big for it to draw well. That’s worth settling while the new furnace is still a quote. Prince William County wants a permit for any gas furnace replacement, even like for like.
About one Bristow home in nine heats with electricity, which in houses this young usually means a heat pump. Its outdoor unit works every month of the year, so in one of those houses a July cooling problem and a January heating problem are often the same part. On a frosty morning, the outdoor unit going quiet and steaming for a few minutes is its defrost cycle doing its job. Lukewarm air from the registers all afternoon is not.
About three in ten homes here are townhouses, and Victory Lakes alone has 609 of them. A three-level townhouse runs warm on top and cool in the basement with nothing wrong at all, because heat rises and one furnace serves every floor. Out toward Brentsville, outside the Census place, nobody publishes a count of what heats those houses, and the fuel can be anything from propane to a heat pump; tell us what’s in the basement when you call.
By the numbers
From the Census Bureau’s 2020 to 2024 survey. Median year built and heat count owner-occupied homes only.
What you’d notice
Before the burners fire, a small fan clears the flue. On a furnace near twenty its bearings wear, and the first sign is a whine or a rattle in the seconds before the flame comes on. Caught early it’s a motor swap; left alone, it stops the furnace on a cold night.
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
Prince William County Fire and Rescue says to have a qualified technician inspect the heating system and chimneys every year, to make sure nothing blocks the fumes from venting out of the house. Source.
Prince William County Fire and Rescue lists furnaces and water heaters among the household sources of carbon monoxide, and says to put a CO alarm outside each sleeping area and on every level of the home and to test it monthly. 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.
If the furnace and the gas water heater share one metal flue, a high-efficiency replacement leaves the water heater venting alone up a pipe sized for both. Ask whether the quote covers checking that flue for the appliance left on it.
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 Bristow: Nokesville, Manassas, Gainesville, Catharpin and Centreville.
Questions
A gas one will, every time, matching model or not; Prince William keeps gas furnaces on its always-permitted list. An electric furnace or a heat pump traded for the same type where the old one stood is exempt, and a repair with replacement parts never needs one.
Not much. A propane furnace takes the same repairs as a natural gas one, flame sensor and igniter through to the circuit board; its gas valve is simply set up for propane. Mention it when you book, so the tech arrives ready to check propane pressures.
Open the burner door and find the rating plate. The serial number usually encodes the year, and a tech can read it for you. If your house went up near Bristow’s 2004 median and nobody has replaced the furnace, it’s in its early twenties, and a big repair deserves a replacement number beside it.
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 Bristow 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.