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Furnace and AC replacement in Lorton runs $8,898 to $23,000 installed. The typical owner’s house here dates from 1997, and many are due for both at once.
Price range
$8,898-$23,000
8yrs @ 7.99%
$126/mo
15yrs @ 9.99%
$96/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
One of our technicians with a new Trane outdoor unit he just installed beside a Northern Virginia house.
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
$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
or $148/mo at 0% APR for 60 months
Furnace alone, keeping your AC
$4,285 to $14,040
or $71/mo at 0% APR for 60 months
Heat pump system instead
$8,499 to $21,650
or $142/mo at 0% APR for 60 months
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 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.
What’s different in Lorton
The typical owner’s house in Lorton went up in 1997, and the ZIP’s homes split almost evenly between two building waves: about four in ten from the 1980s and 1990s, and a little more than four in ten since 2000. Fewer than one in five is older. Each wave is due for a new pair for its own reason.
The newer wave, most of Laurel Hill and close to half of the Lorton Census place, still runs plenty of builder pairs from the 2000s. A furnace and an air conditioner put in the same week wear on the same calendar, and most outdoor units from those years hold R-22, which hasn’t been made since 2020. When one half fails, the other usually isn’t far behind, and doing both means one permit, one trip into the attic or basement, and a matched coil and outdoor unit on the newer refrigerant.
The older wave has usually been through this once: a house from the late 1980s or 1990s is often on its second pair, and those are getting on too. There the bigger question is the ductwork, the same runs the house was built with, sized for whatever went in first. We look at the return and supply runs before choosing a size, because going bigger on original ducts mostly buys noise.
In the Lorton Census place more than a third of homes are rented and about a quarter sit in condo and apartment buildings. A landlord usually wants the swap done between tenants, and a condo owner needs the association’s sign-off on the outdoor half first. On Mason Neck, where close to two in three owners heat with electricity, the matching job is usually a heat pump system, $8,499 to $21,650 installed.
Neighborhood by neighborhood
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 |
|---|---|---|---|---|
| Lorton | 2001 | single-family houses, about 4 in 10 | gas, about 7 in 10 | Many still on the builder’s furnace and air conditioner. |
| Newington | 1981 | townhouses, about 6 in 10 | electricity, about 6 in 10 | Mostly electric heat, so usually a heat pump swap instead. |
| Laurel Hill | 2002 | single-family houses, about 4 in 10 | gas, about 8 in 10 | Many still on the builder’s furnace and air conditioner. |
| Mason Neck | 1973 | single-family houses, nearly all | electricity, about 6 in 10 | Mostly electric heat, so usually a heat pump swap instead. |
By the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
ZIP 22079 as a whole: every Lorton address. Most of Newington, in the table, has Springfield mail.
When it’s time
Plenty of two-story Lorton houses from the 2000s cool and heat the bedroom floor with a second system in the attic. Both went in the same year, and each is priced on its own. The attic one usually has the harder life, baking all summer, so it’s often the one to do first.
Plenty of houses built since 2000 still run the builder’s furnace and AC. They wear out on about the same schedule, so when one goes, price the pair.
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.
Permits and sign-offs
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.
Our Virginia Class A contractor license, 2705192276, is on the side of the van.
Choosing who installs it
Ask every company that quotes the job, us included.
A Lorton house with two systems should get two line items, each sized for the floor it serves. One lump number hides whether the attic system was sized for the bedrooms or simply matched to the old one.
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.
Furnace, outdoor unit, matching coil, refrigerant lines, thermostat, permit and hauling the old one away. If it isn’t on the paper, ask.
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.
Two of our crew going over a work order before the day's calls.
The system we put in first
Built to take a beating. Put in by our crew.
Heat lamps, snow and rain on one outdoor unit: that’s Trane’s own film. We’re a Trane Comfort Specialist, on Trane’s own dealer locator, and when you pick a Trane, our crew puts it in.
Films: Trane’s own.
From our Google reviews
5.0 stars across 1,132 reviews. Read them on our reviews page.
They replaced my AC system and got it up and running with great service. Moises and Efrain are great!
Where we work
Next door to Lorton: Fort Belvoir, Springfield, Woodbridge, Fairfax Station and Burke.
Questions
Most likely not; most 1990s systems have been replaced at least once. The outdoor unit’s data plate names its refrigerant and usually its year, and the furnace carries its own. If both are past fifteen years, the HVAC replacement estimator gives the pair’s range for your house.
It can land higher in the range. Carrying a furnace up a pull-down ladder and working under a hot roof takes longer than a basement swap, and the quote says so up front. If the old system may still be worth fixing, the diagnostic visit is $99.
$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.
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.
Ready when you are
Call, send the form at the top, 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
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 Lorton 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.