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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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Gas furnace, propane furnace and heat pump repair in Warrenton, from Main Street to New Baltimore and Vint Hill, priced from our book before any 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 Warrenton
About six in ten owners inside the Town of Warrenton heat with gas, and the Town sits in Columbia Gas of Virginia’s service area. Close to three in ten heat with electricity, which usually means a heat pump with electric strips behind it. The town’s homes come from two eras: close to three in ten went up before 1960, and about a third between 1980 and 1999.
When an old furnace in one of the pre-1960 houses gives way to a high-efficiency model, the new one usually vents through a wall in plastic pipe instead of up the chimney. In the Historic District that pipe is an outside change, so it needs a Certificate of Appropriateness application, and the Town’s design guidelines ask for the least damaging way through a masonry or frame wall and for any visible line to be painted to blend in. The chimney itself stays: the guidelines count taking down a historic chimney as inappropriate even when the fireplace under it has been closed in.
A repair made with replacement parts needs no permit: the Town’s list says so, and Fauquier County treats ordinary repairs the same way. A replacement is different. Inside the limits the Town’s own Building office issues the permit for a new gas furnace. Outside them it’s Fauquier County, which wants one for any appliance that burns fuel, propane included, and issues trade permits at the counter the same day the application comes in.
In New Baltimore, on the county side of 20187, about half the owners heat with gas, close to three in ten with electricity, and about one in seven with propane from a tank in the yard. A propane furnace takes the same repairs as a natural gas one, and we do both, with the burner pressure checked against the label for whichever fuel feeds it.
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 |
|---|---|---|---|---|
| New Baltimore | 1999 | single-family houses, nearly all | gas, about 5 in 10 | 1980s and 90s houses, most on their second furnace. |
| Warrenton | 1993 | single-family houses, about 5 in 10 | gas, about 6 in 10 | 1980s and 90s houses, most on their second furnace. |
By the numbers
From the Census Bureau’s 2020 to 2024 survey. Median year built and heat count owner-occupied homes only.
Inside the town limits, a little over 4 of the roughly 110 square miles the two Warrenton ZIP codes cover: the Historic District around Main Street, Leeds Square, and the streets off Broadview Avenue and Alwington Boulevard.
New Baltimore only. It’s the one Census place on the county side with mostly Warrenton mail, so the farms and lots beyond it aren’t in these figures.
What you’d notice
If a heat pump is leaning on its backup strips on a mild day, it has stopped carrying its share of the heat. The strips keep the house livable and the meter spinning, and January’s bill tends to say so before the thermostat does. A stuck reversing valve, a failed defrost board or a refrigerant leak is the usual reason.
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
The Warrenton Volunteer Fire Company’s home safety checklist asks for the chimney and the furnace to be cleaned and inspected every year. Source.
The fire company’s checklist also wants a carbon monoxide alarm on each level of the home, none of them more than seven years old. Source.
Fauquier County Fire Rescue takes requests for help getting smoke and carbon monoxide alarms through a form on its Public Education page. 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.
Around Warrenton that can be a gas furnace, a propane furnace or a heat pump, and we repair all three, not oil burners. Anybody you call should tell you just as plainly which ones they fix before a truck heads your way.
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.
We had a mini split ac/heat unit installed. They were here when they said they would be, were very professional, and did a very nice job.
Questions
Not inside the town. The Town of Warrenton is in Columbia Gas of Virginia’s service area, and the Washington Gas heating rebates are written for Washington Gas customers. Ask Columbia Gas what it offers before you pick a new furnace. For a repair it makes no difference: the price comes from our book whoever sends the gas bill.
Your propane supplier first. After a run-out the lines should be leak tested before anything is relit, and that’s the supplier’s job. Once the tank is full and the system has been checked, a furnace that still won’t fire is a repair call, and 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 Warrenton 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.