Furnace and AC replacement in Lorton.
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.
- Your price range up front
- Sized to the house, not the old label
- Dedicated HVAC team
Get your new system priced
Two building waves in 22079, and both are reaching their next system.
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.
The systems across Lorton, 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 |
|---|---|---|---|---|
| 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. |
Lorton houses, by the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
Lorton
ZIP 22079 as a whole: every Lorton address. Most of Newington, in the table, has Springfield mail.
- Median home built1997 Census
- Built before 1980about 2 in 10 Census
- Built since 2000about 4 in 10 Census
- Most homes aresingle-family houses, about 4 in 10 Census
- Heated withgas, about 6 in 10 Census
- Rentedabout 2 in 10 Census
- Townhouse furnaces sit in closets and attics, so the path in matters as much as the size.
What a new furnace and AC costs in Lorton.
$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 Lorton.
Two systems, both the builder’s
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.
Both halves went in with the house
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.
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.
Who signs off on a new system in Lorton.
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 Lorton.
Ask every company that quotes the job, us included.
Did they price each system on its own line?
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.
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.
They replaced my AC system and got it up and running with great service. Moises and Efrain are great!
5.0 stars across 884 Google reviews. Read them on our reviews page.
Furnace and AC replacement questions from Lorton.
My Lorton house is from 1997. Is it still on its original system?
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.
Does an attic system in Laurel Hill cost more to replace?
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.
How much does a new furnace and AC cost in Lorton?
$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.
Furnace and AC replacement in the towns next door.
- Furnace and AC replacement in Fort Belvoir
- Furnace and AC replacement in Springfield
- Furnace and AC replacement in Woodbridge
- Furnace and AC replacement in Fairfax Station
- Furnace and AC replacement in Burke
More from SwiftPro in Lorton
- AC repair in Lorton
- AC tune-up in Lorton
- Air duct cleaning in Lorton
- Dryer vent cleaning in Lorton
- Ductless mini splits in Lorton
- Furnace repair in Lorton
- Furnace replacement in Lorton
- Furnace tune-up in Lorton
- Heat pump replacement in Lorton
- Plumbing in Lorton
- Sewer camera inspection in Lorton
- Sump pump replacement in Lorton
- Water heater flush in Lorton
- Water heaters in Lorton
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 Lorton 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.