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, heat pump and boiler repair in Chantilly, 20151 and 20152, from our shop on Lafayette Center Drive. Priced before any panel comes off.
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 Chantilly
In 20151 it’s close to half gas furnaces and half electric heat, which usually means a heat pump. Parts of Chantilly are on Columbia Gas rather than Washington Gas, so two houses in the same town can have different gas companies, different rates and different rebates.
South Riding, in 20152, heats with gas more than almost anywhere we work, about 8 in 10 homeowners, in houses built around 2006. Plenty of those are still running the furnace the builder put in, close to two decades on, and that’s when the inducer motor and the control board start forcing the repair-or-replace question.
The permit office changes at the county line. Replacing a gas furnace in 20151 takes a Fairfax County permit and a chimney vent certification; in 20152 it’s Loudoun County, which since October 2025 skips the plan review when the new furnace keeps the old one’s BTUs and spot. On either side, a furnace that quits in January doesn’t have to wait on paperwork: Virginia lets an emergency replacement start first, with the application in by the end of the next working day.
Our shop is on Lafayette Center Drive in 20151, so Chantilly furnaces are the heating calls closest to home. Boilers are rare in Chantilly’s houses, and when there is one, we service and replace it. What we see is the split: a heat pump on one street, a gas furnace on the next, and across South Riding row after row of gas furnaces installed in the same few years and wearing out on roughly the same schedule.
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 |
|---|---|---|---|---|
| South Riding | 2006 | single-family houses, about 5 in 10 | gas, about 8 in 10 | Townhouse furnaces in closets and attics. |
| Chantilly | 1987 | single-family houses, about 6 in 10 | gas, about 5 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.
What you’d notice
That’s the inducer motor, the small fan that clears the flue before the furnace lights. On a South Riding furnace from around 2006 it’s one of the first big parts to wear. Caught while it’s noisy it’s a repair; once it seizes, the furnace won’t start at all.
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
Fairfax County Fire and Rescue says to have the heating system cleaned and checked by a professional every year, and to keep anything that burns at least three feet from the furnace and the water heater. Source.
Fairfax County Fire and Rescue names a faulty gas furnace or water heater as a carbon monoxide source, says to have gas appliances inspected every fall, and to put a CO alarm on every floor. Source.
In its fall clock-change reminder, Loudoun County’s fire and rescue system tells residents to check their carbon monoxide alarms, and recommends one outside each sleeping area and on each level of the home, tested 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.
In Chantilly it can be Washington Gas or Columbia Gas. It matters for a replacement: the rates differ, and a utility’s rebates only go to that utility’s customers.
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.
Arrived within an hour on a Sunday morning and provided great service.
Called SwiftPro around 5 am and their electronic system scheduled an appointment for us same day.
Excellent work by Tyler and Team. Right from pricing to performing professional installation of new Heat Pump.
Where we work
Next door to Chantilly: Centreville, Catharpin, Herndon, Aldie and Oakton.
Questions
Small parts, yes: cleaning a flame sensor is $95 to $180, and $240 to $410 covers a new igniter. Big parts on a furnace that age deserve a pause. Put $550 to $1,180 for a control board or $670 to $2,400 for a blower motor next to the cost of a new furnace alone, $4,285 to $14,040 installed, and decide with both in front of you.
It’s the electric heat strips inside the air handler, the heat pump’s backup. They’re there for the coldest mornings, not for all day. If emergency heat is on constantly, the heat pump isn’t doing its job and the electric bill will show it. In 20151, where close to half the houses heat with electricity, it’s one of the first things we look at on a winter call.
Check the thermostat’s fan setting first: ON runs the blower even when the burners are off, AUTO doesn’t. If it’s on AUTO and the air is still cold, the furnace has usually locked out after failing to light, most often a flame sensor or, on a high-efficiency unit, a clogged condensate line.
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 Chantilly 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.