Furnace and heating repair in Chantilly.
Furnace, heat pump and boiler repair in Chantilly, 20151 and 20152, from our shop on Lafayette Center Drive. Priced before any panel comes off.
- Prices in writing, first
- Furnaces, heat pumps and boilers
- Dedicated HVAC team
Get your heating repair priced
Two counties and two gas companies, one town name.
In 20151 it’s close to half gas furnaces and half electric heat, which usually means a heat pump. Parts of Chantilly are on Columbia Gas rather than Washington Gas, so two houses in the same town can have different gas companies, different rates and different rebates.
South Riding, in 20152, heats with gas more than almost anywhere we work, about 8 in 10 homeowners, in houses built around 2006. A lot of those furnaces are original and near 20 years old, the age when the inducer motor and the control board start deciding the repair-or-replace question.
The permit office changes at the county line. Replacing a gas furnace in 20151 takes a Fairfax County permit and a chimney vent certification; in 20152 it’s Loudoun County, which since October 2025 skips the plan review when the new furnace keeps the old one’s BTUs and spot.
What’s heating the houses across Chantilly.
Census figures for the owner-occupied homes in each place, and what that usually means for the heat.
| Place | Median home built | Most homes are | Heated with | What the heat usually is |
|---|---|---|---|---|
| South Riding | 2006 | single-family houses, about 5 in 10 | gas, about 8 in 10 | Townhouse furnaces in closets and attics. |
| Chantilly | 1987 | single-family houses, about 6 in 10 | gas, about 5 in 10 | 1980s and 90s houses, most on their second furnace. |
Chantilly houses, by the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
20151, the Fairfax County side
- Median home built1987 Census
- Built before 1980about 2 in 10 Census
- Built since 2000about 2 in 10 Census
- Most homes aresingle-family houses, about 6 in 10 Census
- Heated withgas, 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.
20152, the South Riding side
- Median home built2006 Census
- Built before 1980hardly any Census
- Built since 2000about 8 in 10 Census
- Most homes aresingle-family houses, about 5 in 10 Census
- Heated withgas, about 8 in 10 Census
- Rentedabout 2 in 10 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.
- A lot of furnaces here are original and near 20 years old, the age when inducer motors and control boards start to go.
What furnace repair costs in Chantilly.
The same price book as the rest of our site. The diagnostic visit is about $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 visitabout $99
Often same-day, and we will tell you honestly when we can get there.
On the Family Care Plan, repairs are 15 percent off, and a heating inspection comes every fall.
What a failing furnace in Chantilly usually does.
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 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 Chantilly.
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 Chantilly.
Questions worth asking anybody who comes out, us included.
Do they know which gas company you’re on?
In Chantilly it can be Washington Gas or Columbia Gas. It matters for a replacement: the rates differ, and a utility’s rebates only go to that utility’s customers.
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.
Arrived within an hour on a Sunday morning and provided great service.
Called SwiftPro around 5 am and their electronic system scheduled an appointment for us same day.
Called SwiftPro around 5 am and their electronic system scheduled an appointment for us same day.
5.0 stars across 884 Google reviews. Read them on our reviews page.
Heating repair questions from Chantilly.
Is it worth fixing a 2006 furnace?
For the small parts, yes: a flame sensor cleaned ($95 to $180) or an igniter ($240 to $410). For a control board ($550 to $1,180) or a blower motor ($670 to $2,400) on a furnace that old, look at the replacement number first. A furnace alone runs $4,285 to $14,040 installed.
What does emergency heat mean on my thermostat?
It’s the electric heat strips inside the air handler, the heat pump’s backup. They’re there for the coldest mornings, not for all day. If emergency heat is on constantly, the heat pump isn’t doing its job and the electric bill will show it.
Why is my furnace blowing cold air?
Check the thermostat’s fan setting first: ON runs the blower even when the burners are off, AUTO doesn’t. If it’s on AUTO and the air is still cold, the furnace has usually locked out after failing to light, most often a flame sensor or, on a high-efficiency unit, a clogged condensate line.
How much does furnace repair cost in Chantilly?
The diagnostic visit is about $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 Reston
- Furnace repair in Fairfax
- Furnace repair in Sterling
- Furnace repair in Ashburn
- Furnace repair in Manassas
More from SwiftPro in Chantilly
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 Chantilly 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.