Furnace and AC replacement in Oakton.
Furnace and AC replacement in Oakton runs $8,898 to $23,000 installed. The typical house here dates from 1984, so the second pair is the one wearing out.
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Oakton’s houses went up around 1984, and their second systems are now past twenty.
Half of ZIP 22124’s owner homes were built before 1984 and half after. Nearly half of all Oakton homes date from 1980 through 1999, a little under four in ten from before that, and fewer than two in ten from 2000 on. Heating and cooling equipment generally gives fifteen to twenty years, so a builder’s pair from the 1980s came out somewhere near 2000 to 2005, and the pair that replaced it is past twenty itself now.
A pair from those years most likely holds R-22 in both the condenser and the indoor coil. A new outdoor unit runs on today’s refrigerants and needs a coil made for them, so replacing the air conditioner alone still opens the furnace closet. When the furnace below is the same vintage, replacing the two together means the closet gets opened once and the county inspects once.
At the west end of Vale Road and Fox Mill Road, the Census counts a separate area, Difficult Run, where almost all the homes are detached houses and close to nine in ten predate 2000. Houses that size frequently run a pair of systems, a downstairs one and an upstairs one, and the two seldom went in the same year. Their labels decide which goes first, and replacing one now and the other in a few years is a perfectly good plan.
In the older single-family streets between Blake Lane and Chain Bridge Road, Grays Oakton among them, a house built before 1980 may be on its third pair, still pushing air through the ductwork designed for the original. There the ducts get measured before anybody picks a size. In the townhouse clusters off Jermantown Road, the outdoor units sit side by side out back, and the association may have a say in where and how big the new one can be.
The systems across Oakton, 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 |
|---|---|---|---|---|
| Oakton | 1981 | single-family houses, about 4 in 10 | gas, about 6 in 10 | 1980s and 90s houses, most on their second furnace and AC. |
| Difficult Run | 1982 | single-family houses, nearly all | gas, about 6 in 10 | 1980s and 90s houses, most on their second furnace and AC. |
Oakton houses, by the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
Oakton
ZIP 22124 as a whole: every Oakton address. The Oakton Census place in the table also takes in streets with Vienna and Fairfax mail.
- Median home built1984 Census
- Built before 1980about 4 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 1 in 10 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.
- Electric heat here usually means a heat pump with backup strips, which is priced as a heat pump system, not a furnace and AC.
What a new furnace and AC costs in Oakton.
$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 Oakton.
Both labels say the early 2000s
Find the year on the furnace’s rating plate and on the outdoor unit’s label. When they match, the two went in together and have aged side by side. A dead compressor on one is your cue to get a number on the other, not a reason to set a new outdoor unit on a tired furnace.
Your heat may not be a furnace
Where a lot of homes heat with electricity, the indoor half is often an air handler, and the like-for-like swap is a heat pump system, $8,499 to $21,650 installed.
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 Oakton.
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 Oakton.
Ask every company that quotes the job, us included.
Two systems in the house: did they price each pair separately?
Ask for a separate line per system, with its age and condition written beside it. Then you can do both now or one at a time, instead of weighing one lump figure for the whole house.
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.
Hard working crew that removed old system and installed new system in a professional manner.
5.0 stars across 884 Google reviews. Read them on our reviews page.
Furnace and AC replacement questions from Oakton.
Should I switch to a heat pump when I replace both in Oakton?
Where there’s a gas furnace, a heat pump can take the air conditioner’s place, and the new furnace covers the coldest nights. Washington Gas pays its largest dual fuel rebate for exactly that job: a qualifying heat pump replacing a central air conditioner, installed with a new 95 percent furnace. Our dual fuel guide has the terms.
How much does a new furnace and AC cost in Oakton?
$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 Oakton.
More from SwiftPro in Oakton
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 Oakton 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.