Open 24/7 for emergencies
A new gas or propane furnace in Aldie runs $4,285 to $14,040 installed, keeping your AC. Stone Ridge’s 2000s builder furnaces are the ones coming due.
Price range
$4,285-$14,040
8yrs @ 7.99%
$61/mo
15yrs @ 9.99%
$46/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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Rather talk now? (703) 997-9757
5.0 stars across 1,132 reviews
Two of our heating technicians beside a gas furnace, the cooling coil on top of it and the water heater to the right.
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 gas furnace on its own, 2 to 5 tons, keeping the air conditioner you have. A single-stage furnace in a small house sits near the bottom; a modulating one in a big house, near the top.
A gas furnace alone, keeping your air conditioner, installed
$4,285 to $14,040
or $71/mo at 0% APR for 60 months
A furnace and air conditioner together, installed
$8,898 to $23,000
or $148/mo at 0% APR for 60 months
Repair 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, at no charge, before anything is ordered.
Natural gas or propane, in a house, a townhouse or a condo, we replace them all. Oil furnaces we don’t.
What’s different in Aldie
Stone Ridge is where Aldie’s furnaces are oldest. Its median owner home dates to 2009, so a furnace that came with one of those houses is in its late teens, and the outdoor unit out back may already be on its second round. That’s the house a furnace on its own suits best: the newer air conditioner stays, and if its coil was changed along with it, the coil stays too, set back on top of the new cabinet.
Sizing is where Loudoun’s rules come in. The County wants a gas permit for every furnace swap, and since October 2025 a replacement skips plans review only if it keeps the BTUs and the spot. Builder furnaces were often picked on the big side, so a new one measured to the house as it stands often comes out the same size or smaller, which keeps it a straight replacement. Bigger, or moved, falls outside that exemption.
Then the vent. Some 2000s builder furnaces are the standard-efficiency kind, venting straight up through the roof in metal pipe, sometimes shared with the gas water heater. A high-efficiency replacement vents in plastic, usually out a side wall, and in Stone Ridge that counts as a changed flue. If the water heater shared the old pipe, the written price should say how it vents once the furnace leaves it.
Propane is a small slice of Aldie: about one owner home in twenty across 20105, and closer to one in seventy inside Stone Ridge, so most propane furnaces sit beyond its edges. They get the same job, with the new furnace converted for propane before it’s lit. In the condo buildings, Mercer Park or Stone Mill Corner among them, read the association documents before booking; they say whose furnace it is and may limit where a vent can leave the building.
By the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
ZIP 20105 as a whole: every Aldie address, inside Stone Ridge and out.
When it’s time
Check the year on each label. If the air conditioner is a recent one and the furnace came with the house, a failing furnace doesn’t have to take the cooling with it. Price the furnace alone and keep the newer half.
At least half the houses here went up since 2010, so the furnace is often the original and still young as furnaces go. A young furnace is usually worth repairing: get the $99 diagnostic and the repair price before anybody prices a new one.
It’s the wall that keeps the burner’s exhaust out of the air the furnace blows through the house. Nobody patches one; a crack ends the repair conversation.
Choosing who installs it
Questions to ask anybody who quotes you, us included.
In Loudoun that decides whether the gas permit needs plans reviewed first. Ask to see the new furnace’s input rating beside the old one’s before you sign.
Ask how they picked the size. Copying the old nameplate repeats whatever was guessed when the house was built.
A new furnace has to work with the coil and the outdoor unit already there. Ask whether they looked at both before quoting a furnace on its own.
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 1,132 reviews. Read them on our reviews page.
Rich did a great job. We hit it off very well. He was on time, and we promptly gathered the necessary measurements. He explained all the details. He prepared the estimate while at the house. This work is for a HVAC full replacement.
Where we work
Next door to Aldie: Haymarket, Middleburg, Ashburn, Catharpin and Chantilly.
Questions
Not the furnace, which never shows from outside. The association only comes into it when the venting changes: its design standards want an approved application for a new or different flue, and none for one put back identical to the old.
Usually not. Across 20105 the median owner home went up in 2013, so most furnaces here are in their early teens, and a repair is often still the right call. The diagnostic visit is $99, the repair is priced before any work, and the HVAC replacement cost estimator shows a new one’s range beside it.
$4,285 to $14,040 installed for a gas furnace on its own, keeping the air conditioner you have; size and efficiency set where yours lands. A furnace and air conditioner together run $8,898 to $23,000. The HVAC replacement cost estimator gives your house its own number.
Fix the small parts on almost any furnace. Past fifteen years, with a repair over a third of the price of a new one, replacing usually wins. Not sure which you’re looking at? The diagnostic visit is $99, and the tech prices the repair before starting it.
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 furnace 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 Aldie 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.