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 Manassas, gas and propane included, in the City and on the county side, with every repair priced 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.
Recent work
What our technicians found and fixed on visits in Manassas, from their notes on each job.
October 2026
A two-zone heat pump with both thermostats switched off: turned back on in heat, both zone dampers checked, and the fan set back to auto. Two thermostats in different modes make the zone board fight itself, so both now run the same mode.
February 2026
No heat: the burners lit and shut right back off. The flame sensor was heavily coated; cleaned, the furnace ran through its full cycle and kept heating.
December 2025
No heat from a shorted gas valve on a gas furnace. A new valve went in and was tested, and the furnace heated the way it should.
What’s different in Manassas
Half the owner homes in the City of Manassas heat with electricity, and in houses built around the City’s 1985 median that usually means a heat pump outside and resistance coils in the air handler for the coldest hours. When the heat pump can’t keep up, those coils end up heating the house alone, everything feels normal, and the cost lands a month later on the power bill, which inside the city limits comes from the City itself.
On the county side gas leads: a little over half the owner homes burn it, and about three in four in Loch Lomond, where nearly nine in ten houses are older than 1980. A furnace in a 1968 Loch Lomond house may still exhaust up the original chimney alongside the gas water heater. Replace it with a high-efficiency furnace, which vents through plastic pipe out a wall, and the water heater is left drafting alone up a chimney built for both. Have that chimney checked as part of the job, not after it.
Buckhall burns the widest mix of fuels in Manassas: a little under half electric, about four in ten gas, about eight in a hundred propane and about four in a hundred oil. We repair propane furnaces as readily as natural gas ones, the same flame sensor, igniter and inducer with a gas valve converted for propane. We don’t work on oil burners. When one in Buckhall gives out, a heat pump or a propane furnace in its place is a job we can price.
More of our Manassas visits are replacement estimates than in most towns we serve. When a repair quote runs big, put the replacement range beside it: a furnace by itself, keeping your air conditioner, is $4,285 to $14,040 installed. From about $71 a month at 0% APR for 60 months, the whole price financed, on approved credit. Our HVAC estimator narrows that for your house before anybody visits.
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 |
|---|---|---|---|---|
| City of Manassas | 1985 | single-family houses, about 4 in 10 | electricity, about 5 in 10 | Mostly electric heat, usually heat pumps with backup strips. |
| Buckhall | 1995 | single-family houses, about 8 in 10 | electricity, about 5 in 10 | A mix of gas furnaces and heat pumps, close to even. |
| Sudley | 1977 | townhouses, about 4 in 10 | gas, about 6 in 10 | Townhouse furnaces in closets and attics. |
| Independent Hill | 2000 | single-family houses, nearly all | gas, about 6 in 10 | Gas furnaces near 20 years old, many still original. |
| Bull Run | 1995 | condo and apartment buildings, about 5 in 10 | gas, about 7 in 10 | Condo and apartment buildings: gas or electric, in compact closet units. |
| Yorkshire | 1984 | single-family houses, about 4 in 10 | gas, about 5 in 10 | 1980s and 90s houses, most on their second furnace. |
| Loch Lomond | 1968 | single-family houses, nearly all | gas, about 7 in 10 | Gas furnaces in older houses, often sharing a chimney with the water heater. |
By the numbers
From the Census Bureau’s 2020 to 2024 survey. Median year built and heat count owner-occupied homes only.
The whole City sits in ZIP 20110. It runs its own water, sewer and electric service.
Sudley and Bull Run in 20109, Yorkshire and most of Buckhall in 20111, Independent Hill in 20112, plus the county edges of 20110.
What you’d notice
On a City heat pump, an aux or emergency heat light that blinks on during a defrost and goes out again is normal. Lit for hours on a mild afternoon, it means the backup coils are doing the heat pump’s job, and a jump in the City power bill with no cold snap behind it says the same thing.
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.
The tech should check the backup coils and their safety limits in the air handler and the defrost controls outside, because a heat pump that has quietly handed the house to its backup still looks like it’s working.
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 service and attention to detail. James was super thorough and explained everything to me. I highly recommend them for any plumbing needs
Called in the morning for a broken furnace. The technician came out same day.
Where we work
Next door to Manassas: Bristow, Nokesville, Clifton, Centreville and Catharpin.
Questions
Yes. We work on natural gas and propane furnaces and on heat pumps, not oil burners. Tell us the fuel when you book, so the right gauges come along. A flame sensor cleaned is $95 to $180 on either fuel.
A gas one does, even a match for the old one: the City lists replacing a gas furnace as mechanical permit work, and its exemption covers only equipment that burns neither gas nor oil, like a heat pump traded for the same kind in a house. The City’s advice to owners is to have the contractor take out the permit.
Usually your landlord. Virginia’s landlord and tenant law puts keeping the heating in good and safe working order on the landlord, and heat has to be supplied in season. Two in three Bull Run homes are rented and about half of Yorkshire’s, so tell the owner or the management company first.
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 Manassas 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.