Open 24/7 for emergencies
The diagnostic visit is $99, and a flame sensor cleaned is $95 to $180 from our published price book.
Get your price in writing
Send this and the office calls or texts you back to set a time.
We’ll call or text this number about your request. By sending it you agree to our terms and privacy policy.
Rather talk now? (703) 997-9757
Furnace and heat pump repair in Leesburg and Lansdowne, natural gas and propane alike, priced from our published book before anyone 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 Leesburg
Inside the Town of Leesburg about two in three owner homes heat with gas and close to three in ten with electricity, mostly heat pumps. Propane heats about two in a hundred and oil about one. We repair gas and propane furnaces and heat pumps, not oil burners.
Four in ten homes in town went up in the 1980s and 90s, and a builder’s furnace from those years usually sent its exhaust up a metal flue it shared with the gas water heater. Many have since given way to high-efficiency furnaces venting in plastic pipe out a side wall, which leaves the water heater on the old flue alone, and a flue built for both can be too big to draw well for one.
Downtown, the Old and Historic District’s design guidelines ask owners to keep their chimneys, and to add roof vents only where they’re inconspicuous, on a side or rear slope rather than the front. That matters the day a furnace is replaced: a high-efficiency unit vents through a wall or the roof, which puts new pipe on the outside of the house, and any exterior alteration there needs a Certificate of Appropriateness. Ask the Town’s preservation staff before settling on where it vents.
Across the town line, gas heats about eight in ten owner homes in Lansdowne, and close to four in ten of its homes are condos. A high-efficiency furnace in a condo closet with no floor drain nearby often pushes its condensate out through a small pump, and when that pump fails, a safety switch shuts the furnace down rather than flood the closet. Water standing in the pump is the clue.
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 |
|---|---|---|---|---|
| Leesburg | 1996 | single-family houses, about 4 in 10 | gas, about 7 in 10 | 1980s and 90s houses, most on their second furnace. |
| Lansdowne | 2005 | condo and apartment buildings, about 4 in 10 | gas, about 8 in 10 | Gas furnaces near 20 years old, many still original. |
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: the Old and Historic District downtown, Exeter and Carrvale inside the bypass, Potomac Station and Edwards Landing outside it.
Lansdowne only. It’s the one Census place outside the town limits, so the farms and lots beyond it aren’t in these figures.
What you’d notice
If the gas water heater’s flame looks lazy, or the metal around its draft hood is scorched since the furnace was changed, the old flue may not be pulling its exhaust on its own. Check that your CO alarms work and have the draft tested before the next cold snap.
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
Inside the town limits, fire and rescue is Loudoun County’s system, answered from the Leesburg Volunteer Fire Company’s Station 1 on West Loudoun Street and Station 20 on Plaza Street, so the county’s heating and carbon monoxide advice applies in town just as it does in Lansdowne. 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 the historic district, the vent’s path decides whether the job needs a Certificate of Appropriateness. A quote that skipped the chimney and the roof slopes skipped the hardest 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.
Swiftpro did a great job fixing my heat pump to get my AC working again. They’re easy to work with and explained everything so that I was able to comprehend the issue well. They beat out other local competitors in price for the same service by 40%.
Where we work
Next door to Leesburg: Paeonian Springs, Hamilton, Waterford, Ashburn and Middleburg.
Questions
No. We work on gas and propane furnaces and heat pumps, not oil burners or oil boilers. The Census counts about one owner home in a hundred in town heating with oil and essentially none in Lansdowne; for those few, an oil heat company is the right call.
Loudoun County. Its Department of Building and Development issues every building permit inside the Town of Leesburg, and a gas furnace swap needs one even like for like; since October 2025, one at the same BTUs in the same spot needs no plans. In the historic district, a new vent on the outside is the Town’s question as well.
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 Leesburg 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.