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 the City of Alexandria and the Fairfax County side, priced before anybody opens a panel.
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 Alexandria
Inside the City of Alexandria we still work on boilers and radiators, the heat a lot of the older houses were built with. On the Fairfax County side they’re rarer. Rose Hill, Fort Hunt and Kingstowne are gas furnace country, and Hayfield most of all, with close to nine in ten homeowners on gas, while Franconia and Woodlawn heat mostly with electricity, which usually means a heat pump.
The chimney matters in the older City houses. Swap an old gas furnace for a high-efficiency one that vents out the side wall, and the water heater is left alone on a flue built for both. That flue gets checked, and sometimes lined, before the job is done.
The paperwork splits at the city line too. On the Fairfax County side, swapping a gas furnace takes a county permit plus a certification that the chimney can vent it, like for like or not. Inside the City, the state rule applies: a gas or oil appliance takes a permit, an electric heat pump swapped in the same spot doesn’t.
Condo buildings are their own kind of heating call. More than half the homes inside the City are in them, and so are most of Huntington’s on the county side. The heat there is usually a heat pump with its air handler in a closet, or a compact gas furnace in the same kind of closet, and the flue, the gas line or the roof can belong to the association. We fix what’s inside the unit and tell you when the trouble is on the building’s side of the wall.
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 Alexandria | 1970 | condo and apartment buildings, about 5 in 10 | gas, about 6 in 10 | Condo and apartment buildings: gas or electric, in compact closet units. |
| Rose Hill | 1969 | single-family houses, about 7 in 10 | gas, about 7 in 10 | Gas furnaces in older houses, often sharing a chimney with the water heater. |
| Franconia | 1986 | townhouses, about 5 in 10 | electricity, about 6 in 10 | Mostly electric heat, usually heat pumps with backup strips. |
| Fort Hunt | 1963 | single-family houses, nearly all | gas, about 8 in 10 | Gas furnaces in older houses, often sharing a chimney with the water heater. |
| Kingstowne | 1994 | townhouses, about 5 in 10 | gas, about 7 in 10 | Townhouse furnaces in closets and attics. |
| Woodlawn | 1976 | townhouses, about 4 in 10 | electricity, about 6 in 10 | Mostly electric heat, usually heat pumps with backup strips. |
| Lincolnia | 1982 | single-family houses, about 4 in 10 | gas, about 7 in 10 | 1980s and 90s houses, most on their second furnace. |
| Mount Vernon | 1967 | single-family houses, about 7 in 10 | 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.
What you’d notice
Usually the expansion tank has lost its air charge, so the pressure climbs every time the boiler heats and the valve lets some out. In one of the City’s older radiator houses that’s a repair, not a new boiler, and it’s worth doing before the valve starts to stick.
Air trapped at the top of a radiator stops hot water from filling it. Bleeding it takes a radiator key and a rag; if it keeps coming back, or the boiler bangs, it’s worth a visit.
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.
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.
Plenty of heating companies only do forced air. In the City’s older houses you want somebody who’ll bleed radiators, check the expansion tank and work on the boiler itself.
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.
Hard to find service like this in Alexandria.
…we had swift and professional responses for multiple plumbing and HVAC needs in our Rosemont Alexandria condo
I returned to SwiftPro for services to add safety devices for water heating system. Thank you Moises for doing a superb job! Very happy with SwiftPro services once again! Cheers!
Where we work
Next door to Alexandria: Arlington, Springfield, Falls Church, Annandale and Fort Belvoir.
Questions
Usually not. Bleed the radiators first. If the tops stay cold, look at the gauge on the boiler: a hot-water system in a house usually sits somewhere around 12 to 15 psi when it’s cold, and much lower means it needs water. If it keeps dropping, there’s a leak somewhere in the loop, and that’s worth a visit.
Yes. Most houses there heat with electricity, which nearly always means a heat pump. A few minutes of cool air in January is the defrost cycle doing its job. A system that sits on emergency heat all day is not normal, and the first winter electric bill usually gives it away.
Only if the house already has ducts, and most City houses built for radiators don’t. A new high-efficiency boiler keeps the radiators you have; running ducts through an old house is a bigger job than most people expect. We’ll price both if you want to see them side by side.
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 Alexandria 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.