Open 24/7 for emergencies
Furnace and heat pump repair in Hamilton starts with a $99 diagnostic visit. Propane furnace or heat pump, the repair is priced from the book first.
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
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 Hamilton
The cooperative station in Purcellville, about two and a half miles west-northwest of town, averages about 115 nights a year at or below freezing, from late October to mid April, and close to 12 days when the afternoon never thaws. Its heating load, 4,942 degree days, runs about 7 percent above Dulles. On January 23, 2025, a mesonet in Hamilton read five below zero.
Electricity heats 665 of the 1,298 owner homes in 20158, nearly always through a heat pump with electric strips behind it. On a five below morning the heat pump still runs but pulls in less heat, and the strips cover the rest. That’s normal. Strips carrying the house on a 40 degree afternoon, or a coil that stays wrapped in ice for hours, isn’t; that usually points at the defrost controls, a sensor or low refrigerant.
Close to three owner homes in ten burn propane from a tank on the property; only 22 burn natural gas. A propane furnace wears out like any gas furnace: a hot surface igniter cracks, a flame sensor fouls, an inducer motor gets loud and then quits. An igniter replaced is $240 to $410. Check the tank gauge before any part: near empty means the first call is to your propane supplier.
The worst weeks are long freezes. From January 25 to February 2, 2026, the Purcellville station never once climbed above freezing. Snow adds its own trouble: a spotter in Hamilton measured 18 inches from the December 2009 storm. A high-efficiency furnace breathes through plastic pipes in the side wall, and once snow seals them it stops itself on purpose; dig them out and it usually restarts. If the power went down with the snow, as it did across Loudoun in February 2010, and the heat won’t come back, call us after the storm and we’ll check the whole system.
By the numbers
From the Census Bureau’s 2020 to 2024 survey. Median year built and heat count owner-occupied homes only.
ZIP 20158 as a whole: every Hamilton address, the Town and the countryside around it. The Census place for the Town alone has too few homes for steady figures.
What you’d notice
Backup strips should step in when the heat pump can’t keep up. If the thermostat falls further behind every hour on a single digit night, a strip, its relay or the thermostat’s second stage may be out, and the $99 diagnostic visit tests each one.
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.
Ask the tech to bring the strips on and measure what they draw. They only matter on the coldest mornings, which is exactly when a burned out one gets discovered the hard way.
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 Hamilton: Paeonian Springs, Waterford, Purcellville, Leesburg and Lovettsville.
Questions
No. The book doesn’t change by fuel: a control board is $550 to $1,180 and a blower motor is $670 to $2,400, tank in the yard or line in the street. Propane adds one step: checking the supply before blaming a part.
A propane furnace still runs its igniter, inducer and blower on house current. Give it a few minutes after the lights return; many thermostats wait before restarting. Still cold? Check the switch beside the furnace and the breaker, then call us.
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 Hamilton 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.