Open 24/7 for emergencies
Lorton AC replacement runs $5,942 to $14,450 installed for a new outdoor unit and coil, with your gas furnace kept. Laurel Hill’s 2002 units lead.
Price range
$5,942-$14,450
8yrs @ 7.99%
$84/mo
15yrs @ 9.99%
$64/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 1,131 reviews
One of our HVAC technicians moving a new condenser up a driveway, the van behind him.
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 central air conditioner on its own, keeping the furnace you have. A single-stage unit on a small house sits near the bottom; a variable-speed one on a big house, near the top.
A central air conditioner alone, keeping your furnace, installed
$5,942 to $14,450
or $99/mo at 0% APR for 60 months
An air conditioner and furnace together, installed
$8,898 to $23,000
or $148/mo at 0% APR for 60 months
A heat pump in the AC’s place, installed
$8,499 to $21,650
or $142/mo at 0% APR for 60 months
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 before anything is ordered.
With Comfort+ membership at $199 a year, the diagnostic visit is included, and half of each repair bill is banked toward replacing that system, up to $1,500.
What’s different in Lorton
Laurel Hill grew up around the old prison grounds the county took title to in 2002, and it grew quickly: 62 percent of its homes date from 2000 or later, the typical owner’s house from 2002. That means a whole neighborhood of air conditioners installed within a few years of each other, now past twenty summers together. Most builder units from those years run on R-22, and no new R-22 has been made since 2020, so every recharge comes out of what’s left. When the neighbors’ condensers start getting replaced, yours is usually close behind.
In Laurel Hill, 84 percent of owners heat with gas, the biggest share anywhere in 22079, so this is AC-only country: the furnace stays, and the outdoor unit and its coil get replaced. Start with the condenser’s label. R-22 means it’s most likely the builder’s, and the furnace under the coil may be too, so look at the pair at $8,898 to $23,000 beside the AC alone. R-410A means someone already replaced it once, and the AC-only number is the one that matters. Either way the new unit runs on one of the newer A2L refrigerants, with a coil made to match it.
About a third of Lorton’s homes are townhouses, their condensers on pads behind the rows, and plenty of associations want to see a new outdoor unit before it’s set. In the two-story single-family houses the bedroom floor often has a system of its own, with the air handler in the attic. That one bakes all summer and tends to go first, and each system is priced on its own. In the Lorton Census place, where 36 percent of homes are rented and about a quarter are condos, the owner or the association signs off before anything is ordered.
The older ends of 22079 cool differently. Newington’s typical owner home dates from 1981, and 57 percent of its owners heat with electricity; on Mason Neck, where the typical house is from 1973, electricity leads as well. What sits out back in those houses is usually a heat pump, which calls for heat pump pricing, $8,499 to $21,650, not an AC quote. The AC-only swap there is for a house with a gas or propane furnace, about one Mason Neck owner in ten on each fuel. Fairfax County calls either job mechanical permit work, with an A2L certification on top.
Neighborhood by neighborhood
Census figures for the owner-occupied homes in each place, and what that usually means for the AC that’s there now.
| Place | Median home built | Most homes are | Heated with | The AC there now |
|---|---|---|---|---|
| Lorton | 2001 | single-family houses, about 4 in 10 | gas, about 7 in 10 | Builder air conditioners, many now near twenty years old. |
| Newington | 1981 | townhouses, about 6 in 10 | electricity, about 6 in 10 | Mostly electric heat, so the cooling is usually a heat pump. |
| Laurel Hill | 2002 | single-family houses, about 4 in 10 | gas, about 8 in 10 | Builder air conditioners, many now near twenty years old. |
| Mason Neck | 1973 | single-family houses, nearly all | electricity, about 6 in 10 | Mostly electric heat, so the cooling is usually a heat pump. |
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
In a two-story Laurel Hill house the attic unit works under a hot roof all summer, and when it’s the 2002 original, each failure costs more than the last: a fan motor one year, a capacitor the next, then a leak in R-22. When a repair quote starts to approach the price of a new unit, replacing that one system and keeping the other running is a fair middle path.
An air conditioner put in before 2010 most likely holds R-22, which hasn’t been made since 2020. A leak on one of those usually ends the repair road.
A house from the 2000s often cools with the condenser it was built with. Past fifteen years, compressors and fan motors start to go, one after another.
Permits, locally
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.
With about a third of Lorton’s homes in townhouse rows and a quarter of the Lorton Census place in condo buildings, the outdoor unit often sits on ground the association has rules about, and a new condenser can be shaped differently from the 2000s one. Ask whether the installer checks those rules and the pad’s clearances before ordering, not on install day.
Ask how they picked the size. Copying the old nameplate repeats whatever was guessed when the house was built.
The outdoor unit and the coil on the furnace are rated as a pair. Ask whether the quote replaces both, and what happens to the line set.
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 1,131 reviews. Read them on our reviews page.
Alex was very professional and the 2 technicians Oscar, and Derek was fast and efficient. They replace my A/C unit within the next day
Where we work
Next door to Lorton: Fort Belvoir, Springfield, Woodbridge, Fairfax Station and Burke.
Questions
Often, yes. R-410A means the outdoor unit was replaced after the house went up, so it’s younger than the furnace, and its refrigerant can still be serviced. Small parts and most leaks deserve a repair quote first, and a $99 diagnostic puts that number beside the new AC’s range. If the furnace under it is the 2002 original, price that too.
Usually not. A heat pump heats as well as cools, and in a house with no gas or propane furnace, trading it for an air conditioner leaves the backup strips doing all the winter work. Keep it a heat pump. If the house has a propane furnace and the outdoor unit only cools, an AC on its own is the job, $5,942 to $14,450 installed.
$5,942 to $14,450 installed for a central air conditioner on its own, keeping the furnace you have; size and efficiency set where yours lands. An AC and furnace together run $8,898 to $23,000. The HVAC replacement cost estimator gives your house its own number.
It’s worth pricing. A heat pump cools exactly like an AC and also heats on mild days, so with your gas furnace it becomes dual fuel. A heat pump system runs $8,499 to $21,650 installed, and we’ll price it both ways.
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 AC 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 Lorton and the rest of Northern Virginia. Virginia contractor license #2705192276. 5.0 stars across 1,131 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.