Open 24/7 for emergencies
Replacing only the gas furnace in Falls Church costs $4,285 to $14,040 installed, AC left in place. In Pimmit Hills about 9 in 10 owners heat with gas.
Price range
$4,285-$14,040
8yrs @ 7.99%
$61/mo
15yrs @ 9.99%
$46/mo
Monthly figures on the starting price, the whole price financed, on approved credit. The lender sets the final terms. How financing works
Get your price in writing
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5.0 stars across 1,132 reviews
Two of our heating technicians beside a gas furnace, the cooling coil on top of it and the water heater to the right.
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 our estimator runs on, for a gas furnace on its own, 2 to 5 tons, keeping the air conditioner you have. A single-stage furnace in a small house sits near the bottom; a modulating one in a big house, near the top.
A gas furnace alone, keeping your air conditioner, installed
$4,285 to $14,040
or $71/mo at 0% APR for 60 months
A furnace and air conditioner together, installed
$8,898 to $23,000
or $148/mo at 0% APR for 60 months
Repair diagnostic visit, if it may be worth fixing
$99
Monthly figures: 60mo @ 0% APR on each starting price, the whole price financed, on approved credit. Longer plans lower the payment and cost more in total. The lender sets the final terms. How financing works
The HVAC replacement cost estimator narrows it to your house. Then a tech measures, and you get the installed price in writing, at no charge, before anything is ordered.
Natural gas or propane, in a house, a townhouse or a condo, we replace them all. Oil furnaces we don’t.
What’s different in Falls Church
Gas heats most of Falls Church. About 7 in 10 owners in the City and in West Falls Church use it, about 8 in 10 in Lake Barcroft, and in Pimmit Hills, mostly single-family houses, the Census puts it at 92 percent. When the heat quits here, the question is rarely which fuel. It’s whether the furnace goes alone or takes the cooling with it.
In houses this old, the furnace alone is often the right call. The median owner-occupied house went up in 1957 in West Falls Church, 1958 in Lake Barcroft and 1961 in Pimmit Hills, before central air was common in houses like these, so the cooling usually came later and has been replaced on its own clock since. A furnace from the early 2000s can sit under a coil and an outdoor unit only a few summers old.
Which permit applies follows the City line, not the mailing address. Inside the City of Falls Church, a gas furnace swapped one for one takes a gas permit, and the City lists a new furnace replacing an equivalent one among the permits its counter can issue without plan review. On the Fairfax County side, a gas furnace needs a permit even like for like, plus a chimney vent certification, and if new gas piping goes in with it, the county makes it a residential plumbing permit instead.
Propane is rare here, about 2 in 100 owners in West Falls Church, but a propane furnace gets the same range, its burner converted for propane before the first fire. Either way, where you land in $4,285 to $14,040 is mostly size and efficiency, and the HVAC replacement cost estimator turns a few answers about your house into your own number.
Neighborhood by neighborhood
Census figures for the owner-occupied homes in each place, and what that usually means for the furnace that’s there now.
| Place | Median home built | Most homes are | Heated with | The furnace there now |
|---|---|---|---|---|
| West Falls Church | 1957 | single-family houses, about 6 in 10 | gas, about 7 in 10 | Gas furnaces on their second or third round, often on a chimney shared with the water heater. |
| Bailey’s Crossroads | 1980 | condo and apartment buildings, about 6 in 10 | electricity, about 5 in 10 | Condo and apartment buildings: mostly electric heat, few furnaces. |
| Idylwood | 1975 | condo and apartment buildings, about 4 in 10 | gas, about 5 in 10 | Condo and apartment buildings: compact furnaces in closets. |
| City of Falls Church | 1964 | condo and apartment buildings, about 5 in 10 | gas, about 7 in 10 | Condo and apartment buildings: compact furnaces in closets. |
| Lake Barcroft | 1958 | single-family houses, about 6 in 10 | gas, about 8 in 10 | Gas furnaces on their second or third round, often on a chimney shared with the water heater. |
| Seven Corners | 1972 | condo and apartment buildings, about 5 in 10 | gas, about 6 in 10 | Condo and apartment buildings: compact furnaces in closets. |
| Pimmit Hills | 1961 | single-family houses, about 7 in 10 | gas, about 9 in 10 | Gas furnaces on their second or third round, often on a chimney shared with the water heater. |
By the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
ZIP 22046, plus a few City addresses in 22042 and 22044.
22041 to 22044: West Falls Church, Idylwood, Lake Barcroft, Seven Corners and Bailey’s Crossroads.
When it’s time
Read both labels. If the condenser outside is only a few years old and the furnace downstairs is pushing twenty, the furnace is the part that’s done. Where cooling arrived after the house was built, the two halves often age apart.
A high-efficiency furnace vents out the side in plastic pipe, which can leave the water heater alone in a chimney sized for two. Ask about that before you pick a furnace, not on install day.
It’s the wall that keeps the burner’s exhaust out of the air the furnace blows through the house. Nobody patches one; a crack ends the repair conversation.
Permits, locally
In the City of Falls Church a one-for-one gas furnace replacement needs only a gas permit. Source.
Our Virginia Class A contractor license, 2705192276, is on the side of the van.
Choosing who installs it
Questions to ask anybody who quotes you, us included.
A Falls Church address can be the City or Fairfax County, and the paperwork changes with it: a City gas permit from City Hall on Park Avenue, or a county permit with a chimney vent certification. A quote that never asks is guessing.
Ask how they picked the size. Copying the old nameplate repeats whatever was guessed when the house was built.
A new furnace has to work with the coil and the outdoor unit already there. Ask whether they looked at both before quoting a furnace on its own.
A good company puts the repair price next to the replacement range and lets you choose. Already holding somebody’s big number? Take the free second opinion first.
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.
Moises and Oscar did a superlative job doing a custom installation of a new HVAC unit in a tight basement space. And they then took the time to go over system operation. Top tier job and service in all respects!
Where we work
Next door to Falls Church: Dunn Loring, Arlington, Annandale, McLean and Vienna.
Questions
Usually, if it cools well and the coil fits the new furnace. The coil usually sits on the furnace’s top, so the two have to match in width and airflow. If the outdoor unit still runs on R-22, price the pair instead, $8,898 to $23,000 installed.
The City of Falls Church makes the case for heat pumps on its own energy pages, and a heat pump cools too. In a gas house with a small electrical panel, though, another gas furnace is the simpler job. The estimator prices both.
$4,285 to $14,040 installed for a gas furnace on its own, keeping the air conditioner you have; size and efficiency set where yours lands. A furnace and air conditioner together run $8,898 to $23,000. The HVAC replacement cost estimator gives your house its own number.
Fix the small parts on almost any furnace. Past fifteen years, with a repair over a third of the price of a new one, replacing usually wins. Not sure which you’re looking at? The diagnostic visit is $99, and the tech prices the repair before starting it.
Ready when you are
Call, or send the form at the top. A tech measures the house and puts the installed price in writing before anything is ordered, and if the old furnace is worth fixing, 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 Falls Church 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.