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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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Furnace and heat pump repair in Annandale, 22003, for owners and landlords: gas and propane, not oil burners, priced from our book 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.
What’s different in Annandale
About seven in ten Annandale owners heat with gas, closer to eight in ten in Wakefield, around Canterbury Woods. In a 1960s rambler or split-level the furnace stands on the lowest floor, in an unfinished corner of the basement or a utility room off the rec room, the water heater a step away. Good news on a repair: the cabinet is easy to reach.
Plenty of these houses now have a high-efficiency furnace, which makes water as it burns. With a floor drain close by, the water just runs there. Across the room from one, it rides through a small pump about the size of a lunchbox, and many of those pumps carry a safety switch that stops the furnace when they can’t keep up.
About a quarter of owners in the Annandale Census place and in Woodburn, where most of the condo buildings are, heat with electricity, usually a heat pump backed by electric strips, and a few burn propane. We work on gas and propane furnaces and on heat pumps, not oil burners.
About a third of homes in the Annandale Census place are rented, four in ten in Woodburn. For apartments and leased condos, Fairfax County enforces the Virginia Property Maintenance Code: heat that keeps bedrooms and living rooms at 68 degrees or warmer from October 15 to May 1, and space heaters can’t be the only source. Below 17 degrees outside, a system running without obvious mechanical defects still counts as compliant, even short of 68.
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 |
|---|---|---|---|---|
| Annandale | 1967 | single-family houses, about 5 in 10 | gas, about 7 in 10 | Gas furnaces in older houses, often sharing a chimney with the water heater. |
| Wakefield | 1968 | single-family houses, nearly all | gas, about 8 in 10 | Gas furnaces in older houses, often sharing a chimney with the water heater. |
| Woodburn | 1968 | single-family houses, about 4 in 10 | gas, about 6 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.
What you’d notice
On a high-efficiency furnace that’s usually the condensate side: a clogged trap, a kinked line or a pump that gave out, and the safety switch did its job. Clearing it is a small repair; leave the furnace off until then.
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
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.
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 an Annandale basement, the pump carrying a high-efficiency furnace’s water to the drain can stop the heat as surely as a bad igniter. A tech should test it, clear the line and the trap, and check its safety switch before selling you a part.
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 work by Tyler and Team. Right from pricing to performing professional installation of new Heat Pump.
Where we work
Next door to Annandale: Falls Church, Springfield, Dunn Loring, Burke and Fairfax.
Questions
Heat back on. The county calls no heat between October 15 and May 1 a building code violation, and a tenant who asks the landlord first and gets nowhere can ask its Department of Code Compliance to inspect. For the landlord, the useful paper is a dated invoice saying what failed and what was fixed. The diagnostic visit is $99.
It sits partly below ground, often on a slab, with soil against part of its walls, and heat rises away from it. The thermostat, usually on the main level, is satisfied before the bottom floor catches up. Balancing the dampers helps; when it doesn’t, a ductless head down there is the usual fix, not a bigger furnace.
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 Annandale 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.