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Furnace and AC replacement in Marshall runs $8,898 to $23,000 installed. Here the furnace half usually burns propane, the heat in one owner home in five.
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 Marshall
The median owner home in 20115 was built in 1986, and more than a third of the ZIP’s homes went up between 1980 and 1999. A house that age is long past its first furnace and air conditioner, and the pair it has now often went in together. Two machines installed the same year age together, and because the outdoor unit’s coil rests on the furnace, replacing them a year apart opens that closet twice.
A furnace and an air conditioner is the less common setup here: electricity heats close to two owner homes in three, which in Marshall mostly means a heat pump and an air handler, a different job with its own price. Here the pair mostly means the propane houses, 424 of the 2,109 owner homes, the handful on natural gas, and some of the 160 that heat mainly with wood and keep a furnace behind the stove.
Where you land in the range follows the house, and Marshall spans both ends. A cottage on Salem Avenue or a story-and-a-half frame house on Anderson Avenue takes a small system, sized to what its ducts can carry if they were fitted long after it was built. The bigger detached houses on acreage around the village often run two systems, one for the main floors and one for the bedrooms, each priced as its own pair.
Marshall built less after 2000: 436 homes went up in that decade and fewer than 200 in the next. Where one of those houses still runs the furnace and air conditioner it was built with, the pair is near or past twenty, and the first failure should bring a price for both. If it might still be a repair, the diagnostic visit is $99.
By the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
ZIP 20115 as a whole: every Marshall address, the village included. The Census place for the village alone has too few homes for steady figures.
When it’s time
In a wood-heated Marshall house the furnace under the coil may have run only as backup for years. Before replacing the outdoor half alone, read the furnace’s label: the new coil has to sit on that cabinet, and one as old as the dead unit is a shaky base for it.
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 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.
Permits and sign-offs
Fauquier County counts swapping an electric appliance for a similar one in the same spot as an ordinary repair that needs no permit. Moving an appliance to a new spot takes one. Source.
Fauquier County wants a permit for any fuel-fired appliance, so a gas or propane furnace replacement is permit work even in the same spot. Trade permits need no plans, and usually no zoning approval. 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.
On a bigger Marshall house with a system for each floor, the second is often as old as the first. Ask for both in writing, then choose: together, or a season apart.
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.
Thank you very much for the great work. The HVAC installation, turned out perfectly. I will recommend SwiftPro service to people I know.
Where we work
Next door to Marshall: Rectortown, Delaplane, The Plains, Orlean and Broad Run.
Questions
Fauquier County. Marshall has no town government, and the County counts any fuel-fired appliance as permit work, so a new propane furnace takes a trade permit from its Department of Community Development in Warrenton, even in the old one’s exact spot.
Two. The propane furnace and the air conditioner on it are a pair, $8,898 to $23,000 installed; the heat pump and its air handler are a heat pump system, $8,499 to $21,650. The HVAC replacement estimator gives a range for each.
$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 Marshall 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.