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Furnace and AC replacement in Ashburn runs $8,898 to $23,000 installed. A builder’s pair is near twenty in Broadlands and Belmont, about fifteen in Brambleton.
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 Ashburn
More of our Ashburn visits are about replacing a heating and cooling system than in any other town where we work regularly, and water heaters come up more than almost anywhere. Seven homes in ten here date from 2000 or later, and the newer neighborhoods were built out section by section. Every house on a street finished in the same season started its furnace and air conditioner the same month, and they’ve run the same hours ever since.
You can read that calendar off the Census. Broadlands' typical owner home went up in 2004 and Belmont’s in 2005, so original pairs there are around twenty. Brambleton’s is from 2011 and Loudoun Valley Estates' from 2013, which puts theirs between twelve and fifteen, the age when an outdoor unit’s first big repair tends to show up.
Ashburn Farm and Ashburn Village are a generation ahead. The typical owner’s house there is from 1998, about half the homes went up from 1980 through 1999, and most are on their second furnace and air conditioner already, not always bought in the same year. If yours were replaced at different times, look at the pair and the furnace alone, $4,285 to $14,040, side by side. When the younger half is within a few years of the older one, replacing both gets a coil, a furnace and an outdoor unit chosen to work together, not a new half bolted to a tired one.
The new outdoor unit will likely be bigger than the old one, so in Ashburn the pad matters. Ashburn Village’s architectural guidelines say as much about high-efficiency units and send any move to a new spot around the house to the review committee. In Brambleton a unit set back where the old one stood needs no application. Check that the pad takes the new cabinet before the order goes in.
Neighborhood by neighborhood
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 |
|---|---|---|---|---|
| Ashburn | 1998 | single-family houses, about 4 in 10 | gas, about 8 in 10 | 1980s and 90s houses, most on their second furnace and AC. |
| Brambleton | 2011 | townhouses, about 5 in 10 | gas, about 8 in 10 | Townhouse systems: a furnace in a closet or attic, the air conditioner out back. |
| Broadlands | 2004 | single-family houses, about 6 in 10 | gas, about 9 in 10 | Many still on the builder’s furnace and air conditioner. |
| Loudoun Valley Estates | 2013 | townhouses, about 6 in 10 | gas, about 8 in 10 | Townhouse systems: a furnace in a closet or attic, the air conditioner out back. |
| Belmont | 2005 | single-family houses, about 6 in 10 | gas, about 9 in 10 | Many still on the builder’s furnace and air conditioner. |
| Moorefield | 2015 | townhouses, about 6 in 10 | gas, about 7 in 10 | Townhouse systems: a furnace in a closet or attic, the air conditioner out back. |
| One Loudoun | 2015 | townhouses, about 4 in 10 | gas, about 7 in 10 | Townhouse systems: a furnace in a closet or attic, the air conditioner out back. |
| University Center | 1996 | condo and apartment buildings, about 4 in 10 | gas, about 8 in 10 | Condo closet systems: small units, often with association rules for the outdoor half. |
By the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
When it’s time
Houses finished in the same season started their systems together. When the neighbors start replacing theirs, yours has the same years on it, and pricing it in April beats deciding in the first August heat wave.
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.
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.
Permits and sign-offs
Loudoun County requires a permit to swap a gas water heater or furnace. Since October 2025, a replacement that keeps the same BTUs in the same spot needs no plans. 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 finished basement, a sunroom or a garage turned into a bedroom adds space the original system never counted. In a 2004 Broadlands or 2011 Brambleton house, size the new pair for the rooms you heat and cool today, with the ducts checked to carry 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
Usually not. Moorefield’s typical owner home is from 2015, so a system there is around ten, young enough that most failures are parts. Start with a $99 diagnostic visit; the repair gets priced before any work starts.
Yes. About one Ashburn owner in six already heats with electricity, a third in Moorefield. A heat pump system runs $8,499 to $21,650 installed, and the HVAC replacement estimator prices either kind for your house.
$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 Ashburn 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.