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Replacing the furnace and the AC together in Amissville, 20106, runs $8,898 to $23,000 installed. The median house here dates to 1993.
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 Amissville
ZIP 20106’s median owner home went up in 1993, and the rest spread wide: about one in eight before 1960, about a third from 1980 through 1999 and about three in ten since 2000. A house at the median age is on, at best, its second furnace and air conditioner. One from 2000 or later may still have the builder’s pair, now well into its twenties.
A furnace with an air conditioner is the setup where propane or gas does the heating: about four owner homes in ten here burn propane, and about two in a hundred have utility gas. The electric houses, a bit over a third, replace with a heat pump system instead, $8,499 to $21,650 installed. At the Boston station heating degree days outnumber cooling degree days, 4,836 to 936, so the furnace is the unit in the pair that does most of the work.
Both ends of the range come up. That station hit 100 degrees on July 8 and 9, 2012, logs about 22 days a year at 90 or higher, and counts about 120 nights at or below freezing, with 12 below zero on January 7, 2014. A house needs cooling sized for the hot afternoons and heating sized for the cold nights, and heating carries the bigger share of the year.
About one owner home in eight here heats with oil. We don’t work on oil burners, so those houses come to us as a switch, and a furnace and AC pair or a heat pump system is what we price. A gas or propane furnace in the pair is permit work in Rappahannock County, Culpeper County and Fauquier County alike; the offices are in Washington, Culpeper and Warrenton.
By the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
ZIP 20106 as a whole: about half its homes are in Culpeper County, about four in ten in Rappahannock County, where the village is, and a few in Fauquier County.
When it’s time
Check both data plates. If the furnace and the outdoor unit went in the same year, the coil and the furnace have aged together, and replacing only one opens the closet now and again a winter or two later. Pairs that went in together tend to fail together.
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
Virginia’s building code lets a home’s mechanical appliance be replaced without a permit only when it isn’t fueled by gas or oil, so in Rappahannock County a gas or propane furnace swap is permit work. Source.
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.
Outside the town limits, Fauquier County issues the permit. It wants one for any fuel-fired water heater, propane included, and for any heater being moved; an electric one swapped for a similar unit in the same spot counts as an ordinary repair. Trade permits go out over the counter the day the application comes in. 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.
Ask how the quote was sized, not just what it costs. A house here needs heat on about 120 nights a year at or below freezing and cooling on about 22 afternoons at 90 or higher, and the heating side does the bigger share. A tech who measured the house, not just the old unit’s label, sized it.
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!
Questions
It follows the fuel. Propane is the largest in ZIP 20106, about four owner homes in ten, and those houses keep a furnace and AC; the electric ones, a bit over a third, take a heat pump. The heating page lays out each option, and a diagnostic visit is $99 if it might still be a repair.
A new furnace on its own, with your air conditioner left in place, comes to $4,285 to $14,040. Whether to replace only one depends on the labels: if the other unit is clearly younger, one at a time can make sense. If they match, price the pair beside it, since the system price covers both at once.
$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 Amissville 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.