Furnace and AC replacement in Fairfax Station.
A new furnace and AC in Fairfax Station runs $8,898 to $23,000 installed, per system. Bigger houses may have two; the estimator quiz prices one at a time.
- Your price range up front
- Sized to the house, not the old label
- Dedicated HVAC team
Get your new system priced
Fairfax Station went up in one building wave, and its systems come due in one.
Eight in ten homes in 22039 were built from 1980 through 1999, and very few still run the furnace and air conditioner they started with. Where the second pair went in together, say during the 2000s, both halves are now near twenty years old or past it, and two pieces installed the same week tend to give out within a few seasons of each other. When one quits, price both.
South Run and Crosspointe show it plainly. In the South Run Census place, 94 percent of homes date from those two decades and nearly 9 in 10 owners heat with gas. Crosspointe came a little later, with a median owner home from 1993, and about three quarters of its owners heat with gas. There, replacing the system usually means a new gas furnace inside and a new condenser out back, matched and sized to the house as it stands now.
Size is the other question. With four or more bedrooms in about 9 in 10 houses, plenty carry two complete systems, the second cooling the bedrooms from the attic. Tell the estimator quiz the house is over 3,000 square feet and it says so plainly: you may need two systems, and its number is for one.
On the big lots the pair may not be gas at all. In the two Census tracts that hold most of Fairfax Station’s septic lots, electricity heats as many owner homes as gas, about 4 in 10 each. In an all-electric house the matching replacement is a heat pump and air handler, $8,499 to $21,650 installed, and in a propane house it’s a furnace converted for propane under a new air conditioner.
The systems across Fairfax Station, place by place.
Census figures for the owner-occupied homes in each place, and what that usually means for a replacement.
| Place | Median home built | Most homes are | Heated with | What the system usually is |
|---|---|---|---|---|
| Fairfax Station | 1982 | single-family houses, about 9 in 10 | gas, about 5 in 10 | 1980s and 90s houses, most on their second furnace and AC. |
| South Run | 1988 | single-family houses, nearly all | gas, about 9 in 10 | 1980s and 90s houses, most on their second furnace and AC. |
| Crosspointe | 1993 | single-family houses, nearly all | gas, about 8 in 10 | 1980s and 90s houses, most on their second furnace and AC. |
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
- A few homes 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 a new furnace and AC costs in Fairfax Station.
$8,898 to $23,000 installed for a furnace and air conditioner replaced together, 2 to 5 ton, from the same price book as our estimator. Where you land depends on the size of the house, the efficiency you pick, and what the ductwork and venting need.
- Furnace and AC together, installed$8,898 to $23,000
- Furnace alone, keeping your AC$4,285 to $14,040
- Heat pump system instead$8,499 to $21,650
The HVAC replacement estimator gives your house its own number. Then we measure, and the price is in writing before anything is ordered.
Two years of labor come with every install. Monthly plans are on our financing page.
When replacing both makes sense in Fairfax Station.
Two outdoor units with the same year on the label
Each condenser’s data plate shows when it was made. If the years match, the systems went in together, and the one still running is on the same clock as the one that failed. Price both now, then decide on each.
The AC died and the furnace is the same age
A new outdoor unit needs a matching coil, and on a gas system the coil sits on the furnace. If the furnace is as old, do both and open that closet once.
The outdoor unit runs on R-22
The label on its side names the refrigerant. R-22 hasn’t been made or imported in the US since 2020, so a leak gets expensive. Replace it on your schedule, not in July.
Who signs off on a new system in Fairfax Station.
Fairfax County
Fairfax County lists replacing a heating or cooling system as mechanical permit work. Source.
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.
Fairfax County asks for an A2L refrigeration system certification with the permit for any heat pump or air conditioner that runs on the newer A2L refrigerants. Source.
How to pick who replaces your furnace and AC in Fairfax Station.
Ask every company that quotes the job, us included.
Did they go up into the attic before quoting the upstairs system?
An attic system is priced by what it takes to get the old unit down and the new one up: the hatch, the stairs, the platform, the drain pan under it. A quote written from the driveway can’t know that. Ask whether they went up.
Do they size it to the house, or copy the old label?
The old size is a guess somebody made years ago. Ask whether they measure the house and check the ductwork first. Too big short cycles; too small runs all afternoon in August.
Is the whole job in the written price?
Furnace, outdoor unit, matching coil, refrigerant lines, thermostat, permit and hauling the old one away. If it isn’t on the paper, ask.
Already holding another company’s quote?
Our free second opinion looks at the system you were quoted on and tells you what it actually needs, with our price if you want it.
What our customers say.
Very professional HVAC installation, knowledgeable technicians, clean work,respectful of property, punctual, conscientious.
5.0 stars across 884 Google reviews. Read them on our reviews page.
Furnace and AC replacement questions from Fairfax Station.
Do both systems in our Fairfax Station house have to be replaced together?
No. If one is failing and the other runs well, replacing one now and the other later is a sound plan, and each written price stands on its own. Doing both at once means one round of measuring and one install, with matching equipment upstairs and down.
Our early 2000s Crosspointe house still has its builder furnace and AC. Replace both?
Price both now. About 1 in 6 Crosspointe homes went up after 2000, and a pair from the early 2000s is past twenty years old. Price the replacement before it fails rather than after; if it’s acting up first, a repair diagnostic visit is $99.
How much does a new furnace and AC cost in Fairfax Station?
$8,898 to $23,000 installed for the pair, by size and efficiency. A furnace alone, keeping your AC, is $4,285 to $14,040. The HVAC replacement estimator gives your house its own number.
Do I have to replace both at the same time?
No. If the AC is young and only the furnace failed, replace the furnace. If they’re the same age, do both: a new outdoor unit needs a matched coil, and one built for the old refrigerant isn’t rated for the new one.
More from SwiftPro in Fairfax Station.
More from SwiftPro in Fairfax Station
Start with your number, then a written quote.
Call, book online, or take the HVAC replacement estimator first. We measure before we quote, and if a repair makes more sense than a new system, 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.