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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, heat pump and propane heat repair in Dumfries, in the Town and out in Montclair and Southbridge, priced from our book before a part comes out.
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 Dumfries
Inside the Town of Dumfries about half the owner homes heat with electricity, four in ten with natural gas, and a little over one in twenty with propane. That propane share is several times Montclair’s, where it’s under one home in a hundred. A propane furnace is built like a natural gas one, set up with smaller burner orifices and its own regulator setting, so it fails in the same places: the flame sensor, the igniter, the inducer. The Town’s utility list names two gas companies, Columbia Gas and Washington Gas, and your bill says which one is yours.
Past the town line the furnaces get younger. Cherry Hill, its median owner home built in 2005, heats with gas in about seven homes in ten, and a high-efficiency furnace from those years vents out a side wall in white plastic pipe and makes water as it burns. That water drains to a pump or a floor drain, and when the line slows, a pressure switch stops the burners. On a furnace that age it’s often the reason for a no-heat call.
The site-built houses run older than the county streets around them. About four in ten Town homes went up before 1980 and about one in ten before 1960, on streets like Tripoli Heights and Whitehaven, where a gas furnace often shares a chimney with the water heater. The townhouse rows, Williamstown and Port O’Dumfries among them, were built from 1974 into the early 1990s, so most of those furnaces and air handlers are second or third generation, right where a control board or a blower motor brings up the repair or replace question.
Rent a house out inside the Town and the heat is Town Hall’s business too. The Town runs a rental inspection program in its rental districts, where a rental needs a Town certificate it gets by passing an inspection, and the property maintenance code its inspectors work from covers heating along with smoke detectors.
Neighborhood by neighborhood
Census figures for each place, and what that usually means for the heat. Median year built and heat count owner-occupied homes only.
| Place | Median home built | Most homes are | Heated with | What the heat usually is |
|---|---|---|---|---|
| Montclair | 1989 | single-family houses, about 8 in 10 | electricity, about 5 in 10 | Mostly electric heat, usually heat pumps with backup strips. |
| Cherry Hill | 2005 | townhouses, about 4 in 10 | gas, about 7 in 10 | Townhouse furnaces in closets and attics. |
| Dumfries | 1985 | townhouses, about 4 in 10 | electricity, about 5 in 10 | Mostly electric heat, usually heat pumps with backup strips. |
By the numbers
From the Census Bureau’s 2020 to 2024 survey. Median year built and heat count owner-occupied homes only.
Nearly all of the Town sits in 22026, with a sliver in Triangle’s 22172. None of it is in 22025.
Montclair in 22025, where the Postal Service accepts Montclair as the town name; Southbridge and Cherry Hill in 22026, outside the town line.
ZIPs 22025 and 22026 as a whole: Montclair, Cherry Hill and the rest of Dumfries mail, the Town’s homes included.
What you’d notice
A high-efficiency furnace breathes through two plastic pipes out a side wall or the roof. Prince William County Fire and Rescue says to keep furnace vents clear of snow during and after a storm, and a drift over those pipes will shut the furnace down until it’s cleared. Brush them off first; if it still won’t light, that’s a visit.
A few minutes of cool air in winter is a defrost cycle, and that’s normal. Cool air all the time, or emergency heat running all day, is a call.
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.
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.
We do, along with the gas furnaces and heat pumps around them. A propane furnace runs on its own orifices and its own pressure, so ask whether the tech reads yours against propane’s numbers before calling the repair done.
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.
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.
Where we work
Next door to Dumfries: Triangle, Quantico, Woodbridge, Lorton and Stafford.
Questions
No, a repair takes none. Replacing one does when it burns gas or propane: Virginia’s building code, which the Town enforces through its own building department, doesn’t exempt swapping a gas-fired appliance, and the Town’s mechanical permit has a furnace replacement line. Outside the town line it’s Prince William County.
It’s costly more than dangerous. Montclair leans electric, and in a heat pump house the emergency setting runs only the backup strips, which cost far more to run than the heat pump does. If it switched over by itself, or the outdoor unit sits still on a mild day, something has failed. The diagnostic visit is $99.
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 Dumfries 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.