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 in Catharpin, ZIP 20143, on propane, gas or electric heat, priced before any panel opens.
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 Catharpin
ZIP 20143 heats three main ways. By the Census, 46% of owner homes use electricity, 34% propane and 7% natural gas, with oil at 8%. Repairs on a propane furnace run the same list as natural gas, flame sensor, igniter and circuit board, with the gas valve and burner orifices set for propane instead. Mention propane at booking, and the tech comes ready to read its line pressure.
About one owner home in twelve here heats with oil. We don’t work on oil burners, so if that’s your system, say so when you call. If the burner is failing, a heat pump or a propane furnace is the switch we can price.
Dulles logs 101.7 days a year with lows at or below freezing and 4.9 days at 10 degrees or colder. The late January 2026 Arctic outbreak brought Extreme Cold Warnings on January 27, 30 and 31, with wind chills as low as 10 below zero. A furnace that limped through October runs flat out in that stretch, and an igniter that was marginal quits. An igniter replaced is $240 to $410.
A snowstorm like January 5 and 6, 2025, with gusts to 45 mph and blowing snow, can drift over the side-wall pipes that carry a high-efficiency furnace’s exhaust and intake air. When a furnace starts, runs briefly and locks out after a storm, clear snow from those pipes first, then call. Our diagnostic visit is $99.
What you’d notice
On a cold Catharpin night, a furnace that lights, runs briefly and quits is often a dirty flame sensor, a weak igniter or a blocked exhaust. A snow-drifted pipe is a shovel job. The other two are repairs, and the tech will price the repair before starting it.
Dust burning off the heat exchanger smells for the first few minutes of the season, then stops. A gas smell is different: leave the house and call your gas company from outside.
Short cycling is usually a clogged filter, a thermostat in a bad spot, or a furnace too big for the house. The filter is the one to check yourself first.
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.
In 20143 the answer could be electric, propane, oil or natural gas, roughly in that order of likelihood. A company that asks first brings the right parts and tells you early if the system is oil, which we don’t repair. Propane and natural gas furnaces share most repairs, but the gas settings differ.
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.
The draft inducer motor on my furnace was failing. They were able to get out same day to look at it. Ordered parts and got a new one installed quickly. The technicians were on time, responsive, and well equipped. Fairly priced too. I have nothing but good things to say.
Where we work
Next door to Catharpin: Gainesville, Haymarket, Centreville, Chantilly and Bristow.
Questions
Prince William County Fire and Rescue advises having a qualified technician inspect the heating system and chimneys yearly, so nothing blocks the fumes from venting out of the house. It also lists furnaces among household sources of carbon monoxide and suggests an alarm outside each sleeping area and on each level. The first fall freeze lands around October 24.
Yes. The same outdoor unit serves January and July. If the thermostat’s auxiliary heat light stays lit through a stretch of mild weather, the strip heat inside is carrying the load, and the cause is usually outside: a sticking defrost control, an iced coil or a tired compressor. The diagnostic visit finds which, and the repair is priced before the work starts.
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 Catharpin 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.