Open 24/7 for emergencies
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 across Woodbridge, Dale City, Lake Ridge and Leesylvania, gas or propane, with the repair priced 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 Woodbridge
About two owner homes in three burn natural gas in Dale City, and about as many in Leesylvania and County Center, where the median owner home dates to 2006 and the builder’s furnace is near 20, old enough for the inducer motor and the control board to start wearing out. Lake Ridge is about half electric and Potomac Mills about two in three, and there the heat is usually a heat pump with electric strips in the air handler for backup.
The Census place called Woodbridge, the older ground along Route 1, is the mixed one. About one home in nine there went up before 1960, and in those the gas furnace often shares a masonry chimney with the water heater, so replacing either one means checking the flue for the other. A few in a hundred heat with propane, and those furnaces are ours, built like natural gas units with burners and a regulator matched to propane. About six in a hundred still burn oil. We don’t work on oil burners, and we’ll say so on the phone.
Power is the other winter question. A gas or propane furnace still needs electricity for its igniter, inducer and blower, so an outage leaves every fuel cold. Inside the Lake Ridge association, a standby generator, or a propane tank to feed one, goes to its Architectural Committee before it’s installed, and the committee can ask for lattice or evergreen screening that hides it from the street.
In a rental, a furnace that won’t run safely is a county code matter as well as a cold tenant. Prince William County’s Neighborhood Services enforces the Virginia Maintenance Code, and lists mechanical equipment that isn’t operable or safe to operate among its common violations. Owners, give us the tenant’s number when you book; we’ll set the time with them and send the price to you.
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 |
|---|---|---|---|---|
| Dale City | 1983 | single-family houses, about 7 in 10 | gas, about 7 in 10 | 1980s and 90s houses, most on their second furnace. |
| Lake Ridge | 1985 | townhouses, about 4 in 10 | electricity, about 5 in 10 | Mostly electric heat, usually heat pumps with backup strips. |
| Woodbridge | 1976 | single-family houses, about 4 in 10 | gas, about 5 in 10 | Gas furnaces in older houses, often sharing a chimney with the water heater. |
| Leesylvania | 2006 | single-family houses, about 4 in 10 | gas, about 6 in 10 | Gas furnaces near 20 years old, many still original. |
| Potomac Mills | 1988 | single-family houses, about 6 in 10 | electricity, about 7 in 10 | Mostly electric heat, usually heat pumps with backup strips. |
| County Center | 2006 | townhouses, about 4 in 10 | gas, about 6 in 10 | Townhouse furnaces in closets and attics. |
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
Most furnaces restart on their own once the lights return. If yours doesn’t, turn its service switch, the one that looks like a light switch on or near the unit, off for a minute and back on. If it still won’t light, or a small light on the control board blinks a pattern, that’s a visit, and the pattern tells the tech where to start.
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.
About half of Lake Ridge and two thirds of Potomac Mills heat with electricity, and on the coldest mornings the strips in the air handler carry part of the load. A tech who only checks the outdoor unit can miss a burned-out strip or relay that only shows itself in a cold snap.
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.
SwiftPro did a truly professional job i in scheduling of my appointment, communication, and sending a technician who explained all issues to me regarding my furnace. Excellent service all around. I highly recommend this company.
Where we work
Next door to Woodbridge: Dumfries, Lorton, Triangle, Fairfax Station and Quantico.
Questions
With gas or propane heat, usually: the blower, the inducer and the controls draw modest power, and a generator wired to the furnace circuit through a transfer switch can carry them. A heat pump is harder: its compressor and backup strips, often 5 to 15 kilowatts on their own, are more than most portable units can handle.
For a gas furnace, yes, every time, even like for like. An electric furnace or heat pump replaced by the same type in the same place needs none, and neither does a repair with replacement parts. Woodbridge has no town government, so Prince William County is the office either way.
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 Woodbridge 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.