Furnace and heating repair in Hamilton.
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.
- Prices in writing, first
- Furnaces, heat pumps and boilers
- Dedicated HVAC team
Get your heating repair priced
Hamilton heats with a heat pump or a propane tank, through long cold snaps.
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.
Hamilton houses, by the numbers
From the Census Bureau’s 2020 to 2024 survey. Median year built and heat count owner-occupied homes only.
Hamilton
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.
- Median home built1988 Census
- Built before 1980about 4 in 10 Census
- Built since 2000about 4 in 10 Census
- Most homes aresingle-family houses, about 9 in 10 Census
- Heated withelectricity, about 5 in 10 Census
- Rentedabout 2 in 10 Census
- Electric heat here usually means a heat pump with electric strips as backup, and a heat pump stuck on those strips shows up on the electric bill.
- A few houses still burn heating oil. We don’t work on oil burners, but a switch to a heat pump or a gas or propane furnace is ours to price.
What furnace repair costs in Hamilton.
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 a failing furnace in Hamilton usually does.
The house slips a degree an hour on the coldest nights
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.
The heat pump blows cool air
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.
It smells the first time it runs
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.
What the county says about your heat in Hamilton.
Loudoun County
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.
How to pick the best furnace repair company in Hamilton.
Questions worth asking anybody who comes out, us included.
Will they test the backup heat, not just the heat pump?
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.
Will they price the part before they fix 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.
Do they look at the venting, not just the flame?
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.
Do they know when a repair isn’t worth it?
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.
What our customers say.
Excellent work by Tyler and Team. Right from pricing to performing professional installation of new Heat Pump.
5.0 stars across 884 Google reviews. Read them on our reviews page.
Heating repair questions from Hamilton.
Does a propane furnace repair cost more than natural gas?
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.
The power came back after a storm, but the heat didn’t. What now?
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.
How much does furnace repair cost in Hamilton?
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.
Should I repair it or replace it?
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.
Furnace repair in the towns next door.
- Furnace repair in Purcellville
- Furnace repair in Leesburg
- Furnace repair in Ashburn
- Furnace repair in Aldie
More from SwiftPro in Hamilton
Tell us what your heat is doing.
Call, or book online and pick a window. 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 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 884 Google reviews. SwiftPro maintains a dedicated HVAC team and a dedicated plumbing team.
SwiftPro Heating, Cooling & Plumbing, 4230 Lafayette Center Dr, Suite N, Chantilly, VA 20151, (703) 997-9757. Book online, read our reviews, or see every town we serve.