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Furnace and AC replacement in Delaplane runs $8,898 to $23,000 installed, most often a propane furnace with the air conditioner’s coil sitting on top.
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 Delaplane
In a propane house the air conditioner is half of a set. Its coil rides on top of the furnace, so a Delaplane system from the 1990s usually has a furnace and a condenser of the same age, wearing out together. About half the homes in 20144 went up in the 1980s and 1990s, the generation coming due now. A heat pump with an air handler, the other common setup in the ZIP, is its own job at $8,499 to $21,650.
Summer at the village’s 449 feet is valley weather. Warrenton 3 SE, the nearest long-record station, averages an 85 degree July afternoon and about 21 days a year at 90 or hotter, with July nights that only drop to about 66. Muggy spells are the real test: in July 2019 the Weather Service put heat index values over 110 across northern Fauquier, with dew points near 70. A pair sized to this house pulls water out of the air along with the heat; one that’s too big runs in short bursts and leaves the rooms damp.
Hail is the other summer risk. On June 2, 2019, hailstones the size of golf balls fell at Aspen Dale Winery, a couple of miles west-southwest of the village. Stones that size fold a condenser’s thin fins flat, and a coil with its fins pressed shut can’t shed heat. Some of that combs straight and some doesn’t. After a hard storm, look the outdoor unit over before cooling resumes, then call us and we’ll check the whole system.
With nearly every home in the ZIP detached, plenty have two systems: a pair in the basement for the main floors and another for the bedrooms, its ducts often running through the attic. Price both even if only one is failing. If they went in together, the second one is rarely far behind.
By the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
ZIP 20144 as a whole: every Delaplane address.
When it’s time
A battered condenser from the 1990s beside a furnace from the same year is the classic case for doing both. The new coil has to match the new outdoor unit anyway, and it sits right on the furnace.
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.
A compressor or heat exchanger on a system past 15 years deserves a replacement price beside it, and you’ll get both numbers.
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.
A 1990s upstairs system often runs its ducts through the attic, where a split joint or a crushed flex run dumps cooled air into the hottest space in the house. Ask whether the quote includes a look up there before the new pair gets sized.
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.
Excellent price and service. Had our AC/heating system replaced. Gave us a great price and top quality install. Can’t say enough good things about them.
Where we work
Next door to Delaplane: Rectortown, Upperville, Marshall, The Plains and Orlean.
Questions
Spring or fall, between the seasons. At Warrenton 3 SE the median last freeze comes around April 9, and the mild weeks after it, like the ones before the first fall freeze, keep the house comfortable while the old pair comes out. A pair that dies in a July heat wave gets replaced on its timetable, not yours.
Yes, if the furnace is young and sound. We check that its blower can move the air the new coil needs before quoting the AC alone. If it’s the other way round, an old furnace and a young AC, a furnace on its own is $4,285 to $14,040 installed.
$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 Delaplane 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.