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 Great Falls, 22066, on natural gas, electricity or propane, with the repair priced from the book before we start.
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 Great Falls
A heating call in Great Falls starts with a question most towns never need: what does the house burn? A little under half the owner homes are on natural gas from the main, and about four in ten heat with electricity, mostly heat pumps. Then come the fuels that arrive by truck. About one in twelve burn propane from a tank in the yard, and about one in eighteen burn heating oil. Across Fairfax County, propane and oil together heat about one owner home in thirty-four. Here it’s about one in seven.
A propane furnace is a gas furnace set up for propane, and it breaks the same ways: a flame sensor gone dirty, a cracked igniter, an inducer motor wearing out. The one failure natural gas never has is an empty tank. If the furnace tries, clicks and gives up in a long cold stretch, check the tank gauge first. If it’s near empty, call your propane supplier before you call us, and have them check the lines before anything is relit.
Oil heat comes with upkeep of its own, all of it an oil heat company’s work, and here it shares the lot with something else. Close to a quarter of the private wells the Health Department has mapped in Fairfax County are inside the Great Falls Census area, and the department lists a leaking fuel oil tank among the things that can foul one. We don’t work on oil burners; when one wears out for good, a heat pump or a propane furnace in its place is ours to price, and the HVAC estimator gives the installed range first.
The houses are big, so the heat is usually split. By the county’s tax records the middle Great Falls house has about 3,700 square feet above ground, plus a basement, and that’s two or three systems: often a furnace in the basement for the lower floors and a second furnace or a heat pump air handler in the attic for the bedrooms. When one floor goes cold, the other system keeps running, so check every thermostat before you call. It tells us which unit to open first.
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 propane furnace, an igniter that glows with no flame following, over and over, can mean the tank is out or the valve at the tank is shut. Look at the gauge before anything else. If there’s fuel and it still won’t light, it’s the igniter or the sensor, and that’s ours.
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 Great Falls it could be natural gas, electricity, propane or oil. We work on the gas and propane furnaces and the heat pumps, not oil burners, and a company that assumes gas from the main plans the wrong visit to a propane house. Say which you have when you book.
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.
Called in the morning for a broken furnace. The technician came out same day.
Questions
Yes. A propane furnace uses the same flame sensors, igniters and boards as a natural gas one: a sensor cleaned is $95 to $180, an igniter or sensor replaced $240 to $410, a control board $550 to $1,180. The tank and the fuel in it are your supplier’s to keep up.
Four in ten owner homes here already heat with electricity, mostly through heat pumps, so plenty of them manage. In a house this size it’s usually split across two or three systems, each sized for its own floor, with electric backup strips, or a propane or gas furnace that takes over in the coldest weeks.
Yes. Fairfax County’s permit page cites the state rule that exempts an appliance swap only when it burns neither gas nor oil, so a propane or natural gas furnace takes a permit even like for like, and a chimney vent certification goes with it.
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 Great Falls 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.