Open 24/7 for emergencies
In Round Hill a heating repair starts with a $99 diagnostic visit, and the heat is mostly propane furnaces and heat pumps.
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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 Round Hill
Of the 2,362 owner homes the Census counts in 20141, only 46 burn natural gas. About 53 percent heat with electricity, usually a heat pump with backup heat behind it, and about 40 percent burn propane from a tank in the yard. So a no-heat call in Round Hill is a propane furnace that won’t light, or a heat pump that can’t hold the house on a hard night, and both are ours to fix.
Thirty years of NOAA normals from the Purcellville station, three miles east, put the average January low at 24.5 degrees, close to 115 nights a year at freezing or below, and 4,942 heating degree days, about 340 more than Dulles. A weather station a mile southeast of town read 5 below on the morning of January 23, 2025, an unofficial reading, and late January 2026 brought wind chills to 10 below across the Virginia Piedmont.
Snow piles up here too: a spotter a mile west-northwest of town measured 36.3 inches in the January 2016 blizzard. A high-efficiency furnace breathes through two white plastic pipes in the side wall, often low down, and a drift over them trips the pressure switch and shuts it down. Clear the snow well back from both, and if it still won’t fire, call us. In a long storm, read the propane gauge too.
Ice is the heat pump’s version. Freezing rain glazed Round Hill with up to 0.15 inch of ice on February 7, 2018, and ice over the whole cabinet can be more than a defrost cycle clears. If the fan is caged in ice, set the thermostat to emergency heat and phone us. Storms take the power too, and a system that won’t restart after an outage may have a tripped breaker or a control board that took the surge, $550 to $1,180 if it’s the board.
By the numbers
From the Census Bureau’s 2020 to 2024 survey. Median year built and heat count owner-occupied homes only.
ZIP 20141 as a whole: every Round Hill address, the Town and the neighborhoods around it. The Census place for the Town alone has too few homes for steady figures.
What you’d notice
It lights, burns a moment, then the flame quits and the cycle starts over. On propane that’s most often a flame sensor coated over, cleaned for $95 to $180, though a nearly empty tank can look the same, so read its gauge first.
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.
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.
Safety and paperwork
Loudoun County Fire and Rescue says to have heating equipment and chimneys cleaned and inspected every year by a qualified professional, and to keep anything that can burn at least three feet from all heating equipment. 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.
A heat pump here usually has backup heat, electric strips or a propane furnace, and a setting that decides when it takes over. Ask the tech what yours is set to. Set wrong, the backup either runs all winter or stays off on the night the house needs it.
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.
Very pleasant experience. Unfortunately the original heating system, that was brand new 56 years ago, is requesting retirement. A replacement unit is in consideration.
Where we work
Next door to Round Hill: Purcellville, Bluemont, Philomont, Hamilton and Middleburg.
Questions
Not by itself. On the coldest nights an older heat pump can’t carry a house alone, so it runs without stopping while the backup fills the gap, and in an average year the Purcellville station dips to 10 degrees or below on about five nights. It’s a call when the house won’t hold the thermostat setting, the outdoor coil stays white after a defrost, or the backup never seems to come on.
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 Round Hill 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.