Furnace and heating repair in Dunn Loring.
Furnace repair in Dunn Loring starts with a $99 diagnostic visit, and a flame sensor cleaned is $95 to $180, priced in writing before work.
- Prices in writing, first
- Furnaces, heat pumps and boilers
- Dedicated HVAC team
Get your heating repair priced
Gas heat in two homes of three, against winters with big snows and long cold weeks.
Vienna’s cooperative weather station, 3.6 miles west, keeps the closest long-term record: a January low averaging 23 degrees, about 99 nights a year at freezing or colder, and close to 4,900 heating degree days, five times its cooling degree days. In half of all years the first freeze comes by October 29 and the last not until April 14, and about four nights a year reach 10 or lower.
About two thirds of 22027’s owner homes heat with natural gas. The typical house went up in 1991, and the furnace usually sits in the basement. Most of today’s furnaces light with a hot surface igniter, $240 to $410 to replace. The high-efficiency kind vents out a side wall through two plastic pipes and drains water as it burns, and a slow drain shuts it down on the coldest night it can find.
Close to three in ten heat with electricity, usually a heat pump with electric strips as backup. On the few nights Vienna’s record puts at 10 or below, the strips carrying the load is normal; strips running through a 40-degree afternoon mean the heat pump has quit pulling its weight. A couple of homes in a hundred burn propane, and we repair those furnaces too, with the gas pressure set for propane.
Fairfax County got 20 to 28 inches of snow in February 2010, with outages countywide from snow-loaded trees and lines, and 23 to 31 inches in the January 2016 blizzard. Snow drifting over a high-efficiency furnace’s two pipes trips a safety switch and puts the burners out, so after a big storm, clear them before you shovel out the car. A power cut stops a gas furnace too, since the igniter, inducer and blower run on electricity. If the heat doesn’t come back with the lights, call us, and we’ll check the furnace, its vent pipes and its controls.
Dunn Loring houses, by the numbers
From the Census Bureau’s 2020 to 2024 survey. Median year built and heat count owner-occupied homes only.
Dunn Loring
ZIP 22027 as a whole: every Dunn Loring address. The Dunn Loring Census place is bigger: about three in four of its homes have Vienna mail.
- Median home built1991 Census
- Built before 1980about 3 in 10 Census
- Built since 2000about 2 in 10 Census
- Most homes aresingle-family houses, about 9 in 10 Census
- Heated withgas, about 7 in 10 Census
- Rentedhardly any Census
- Most heat here is a gas furnace, so most calls come down to the flame sensor, the igniter, the inducer motor or a pressure switch.
What furnace repair costs in Dunn Loring.
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 Dunn Loring usually does.
It quit in the middle of a cold week
Late January 2026 brought Extreme Cold Warnings on three nights and wind chills to 10 below across the Piedmont. A week of nearly nonstop running finds whatever was tired: an inducer motor, a pressure switch, a blower motor running hot, $670 to $2,400 if it’s done. One that came back after a reset still deserves a look.
It lights, then shuts off
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.
It won’t light at all
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.
What the county says about your heat in Dunn Loring.
Fairfax County
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.
How to pick the best furnace repair company in Dunn Loring.
Questions worth asking anybody who comes out, us included.
Will they check the backup heat on a heat pump?
Ask whether the tech tests the electric strips and what brings them on. Working strips can hide a heat pump that has quit; watching the outdoor unit run in heat mode tells the difference.
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.
Technician Steven came out to look at our heat that was not working properly. He was extremely pleasant and knowledgeable. He went out of his way to explain the issue and our options for the repair. We felt like we were in good hands. Great customer service.
5.0 stars across 884 Google reviews. Read them on our reviews page.
Heating repair questions from Dunn Loring.
Does a furnace repair in Dunn Loring need a permit?
A repair doesn’t. Replacing a gas or propane furnace takes a Fairfax County permit, even like for like, and a chimney vent certification, Vienna mail or not.
My Dunn Loring house still has its 1991 furnace. Worth repairing?
If it’s the original, it’s past the fifteen to twenty years most gas furnaces run. Fix a flame sensor or an igniter; before a big motor or a heat exchanger, price a furnace alone at $4,285 to $14,040 installed.
How much does furnace repair cost in Dunn Loring?
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 Vienna
- Furnace repair in Falls Church
- Furnace repair in McLean
- Furnace repair in Annandale
- Furnace repair in Oakton
More from SwiftPro in Dunn Loring
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 Dunn Loring 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.