Furnace replacement in Fairfax Station.
Replacing just the furnace in Fairfax Station runs $4,285 to $14,040 installed, keeping your air conditioner. The estimator quiz narrows it to your house.
- Installed price in writing
- Sized to the house, not the old nameplate
- Dedicated HVAC team
Get your furnace priced in writing
In a Fairfax Station house the furnace is often older than the air conditioner.
Close to half of all homes in 22039 were built during the 1980s, and half the owner-occupied houses date from 1988 or earlier, so most have been through more than one round of heating and cooling equipment. The two halves rarely wear at the same pace. The outdoor unit sits through every August and every ice storm while the furnace lives indoors, so the air conditioner usually goes first, and the pair stops matching.
That mismatch is what a furnace-only job is for, and the data plate on the outdoor unit decides whether it fits: it gives the year and the refrigerant. Under about ten years old, the air conditioner is worth building around. The new furnace’s blower is set for its size, and the coil above usually comes off and goes back on the new cabinet. Made before 2010, it most likely holds R-22, and the fair comparison is a furnace alone against $8,898 to $23,000 for the pair.
Out on the big lots the fuel can change. In the two Census tracts that hold most of Fairfax Station’s septic lots, propane heats about 1 in 12 owner homes, against about 1 in 30 across the ZIP. A propane furnace is the same kind of furnace, converted at install. The tank and its regulator are often the propane company’s, so tell them a new furnace is coming, particularly a larger one.
Where the furnace sits matters as much as which one you pick. In a 1980s basement it often sits near the middle of the house, on a flue it may share with the water heater. A standard-efficiency furnace can usually keep using that flue. A high-efficiency one needs two plastic pipes out through a wall and a drain for its water, and if the basement was finished since, they cross a finished ceiling to get outside. On the estimator quiz, Heating Only prices a furnace by itself.
The furnaces across Fairfax Station, place by place.
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 |
|---|---|---|---|---|
| Fairfax Station | 1982 | single-family houses, about 9 in 10 | gas, about 5 in 10 | 1980s and 90s houses, many on their second furnace. |
| South Run | 1988 | single-family houses, nearly all | gas, about 9 in 10 | 1980s and 90s houses, many on their second furnace. |
| Crosspointe | 1993 | single-family houses, nearly all | gas, about 8 in 10 | 1980s and 90s houses, many on their second furnace. |
Fairfax Station houses, by the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
Fairfax Station
ZIP 22039 as a whole: every Fairfax Station address. The Fairfax Station Census place in the table also takes in streets with Fairfax mail.
- Median home built1988 Census
- Built before 1980about 1 in 10 Census
- Built since 2000about 1 in 10 Census
- Most homes aresingle-family houses, nearly all Census
- Heated withgas, about 6 in 10 Census
- Rentedhardly any Census
- Bigger single-family houses often run two systems, and each furnace is priced on its own.
What a new furnace costs in Fairfax Station.
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
- A furnace and air conditioner together, installed$8,898 to $23,000
- Repair diagnostic visit, if it may be worth fixing$99
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.
When a new furnace makes sense in Fairfax Station.
The condenser was replaced, the furnace never was
Read the data plates on both. If the outdoor unit is from the last several years and the furnace still dates from the 1990s or early 2000s, the furnace is the half that’s due, and it’s better priced before the first cold snap than during one.
The heat exchanger is cracked
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.
It’s fifteen or older and acting it
Fifteen to twenty years is a gas furnace’s usual run. Past that, parts get harder to find and each repair buys less time.
Who signs off on a new furnace in Fairfax Station.
Fairfax County
Fairfax County requires a permit to replace any gas appliance, even like for like: a gas water heater, furnace or boiler. Replacing a fuel-burning appliance also needs a chimney vent certification. Source.
How to pick the best furnace replacement company in Fairfax Station.
Questions to ask anybody who quotes you, us included.
Did they price both efficiencies, with the vent route for each?
A standard furnace usually reuses the flue that’s there; a high-efficiency one needs a new way outdoors and somewhere to drain. Ask for the two written up side by side, with where the new pipes would run, so the gap between the prices has a reason you can see.
Did they size it to your house?
Ask how they picked the size. Copying the old nameplate repeats whatever was guessed when the house was built.
Did they check the air conditioner you’re keeping?
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.
Will they tell you if it’s worth fixing?
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.
What our customers say.
Jaime was great! He was on time, professional, showed me how to change the filter on my new Rheem system and took care of my outside unit too! Thank you!
5.0 stars across 884 Google reviews. Read them on our reviews page.
Furnace replacement questions from Fairfax Station.
Can we replace just one furnace in a two-system Fairfax Station house?
Yes. Each system is its own job with its own written price. In a big house the second system is often in the attic over the bedrooms, and an attic gas furnace is the harder swap: the old one comes down and the new one goes up through the hatch or the pull-down stairs. Tell us where the attic access is when you book.
How much does a new furnace cost in Fairfax Station?
$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.
Should I repair it or replace it?
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.
Furnace replacement in the towns next door.
- Furnace replacement in Burke
- Furnace replacement in Clifton
- Furnace replacement in Springfield
- Furnace replacement in Fairfax
- Furnace replacement in Annandale
More from SwiftPro in Fairfax Station
- AC repair in Fairfax Station
- AC tune-up in Fairfax Station
- Air duct cleaning in Fairfax Station
- Dryer vent cleaning in Fairfax Station
- Ductless mini splits in Fairfax Station
- Furnace and AC replacement in Fairfax Station
- Furnace repair in Fairfax Station
- Furnace tune-up in Fairfax Station
- Heat pump replacement in Fairfax Station
- Plumbing in Fairfax Station
- Sewer camera inspection in Fairfax Station
- Sump pump replacement in Fairfax Station
- Water heater flush in Fairfax Station
- Water heaters in Fairfax Station
The range first, then your number.
Call, or book online and pick a window. 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 is a licensed, BBB Accredited (A rating), independently owned heating, cooling and plumbing company in Chantilly, serving Fairfax Station 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.