Open 24/7 for emergencies
Replacing both furnace and AC in Leesburg runs $8,898 to $23,000 installed. Lansdowne’s builder pairs from the mid 2000s are near twenty now.
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 Leesburg
Inside the town limits the median owner home is from 1996, and four homes in ten went up in the 1980s and 90s. Very few of those still run the builder’s equipment. What’s there now is usually a second round bought one half at a time, an air conditioner after one hot July, a furnace after one cold snap, so the two can be years apart. When they’re close in age and one is failing, price the pair before fixing either.
Lansdowne runs on its own clock. Nearly nine in ten of its homes went up after 2000 and the median owner home dates to 2005, so plenty of furnaces and air conditioners there are originals, started the same month and worn the same hours. When one half of a pair like that gives out near twenty, the other is rarely far behind, and doing both is one install, not two a few winters apart.
Downtown the harder question is where the new outdoor unit stands. The Town’s guidelines for the Old and Historic District place mechanical units at the side or rear, screened from the street with plantings or a fence and gathered in one spot where possible, and rule out rooftop units on the front. A Certificate of Appropriateness covers every exterior alteration there, in-kind replacement of material included, so call the Town’s preservation staff before the order goes in.
About three Leesburg homes in ten are townhouses, and close to four in ten in Lansdowne are condos. In both, the furnace often hides in a closet or the attic, and the new one has to come in the way the old one leaves.
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 |
|---|---|---|---|---|
| Leesburg | 1996 | single-family houses, about 4 in 10 | gas, about 7 in 10 | 1980s and 90s houses, most on their second furnace and AC. |
| Lansdowne | 2005 | condo and apartment buildings, about 4 in 10 | gas, about 8 in 10 | Many still on the builder’s furnace and air conditioner. |
By the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
Inside the town limits: the Old and Historic District downtown, Exeter and Carrvale inside the bypass, Potomac Station and Edwards Landing outside it.
Lansdowne only. It’s the one Census place outside the town limits, so the farms and lots beyond it aren’t in these figures.
When it’s time
If the outdoor unit on a Lansdowne house needs refrigerant added year after year, it’s leaking. One built before 2010 may take R-22, which the EPA has barred from production and import since 2020. With a furnace the same age under the coil, price the pair before paying for another top-up.
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’s Department of Building and Development issues every building permit inside the Town of Leesburg. Where the Town needs its own zoning permit, the county won’t release the building permit until the Town has approved it. 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.
Downtown, moving a condenser or running new refrigerant lines up a wall people can see is the Town’s question before anyone else’s. A contractor who knows Leesburg asks before choosing a spot for the pad.
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.
On spec and on price for our A/C replacement. Showed up on time and all went as promised
Where we work
Next door to Leesburg: Paeonian Springs, Hamilton, Waterford, Ashburn and Middleburg.
Questions
Loudoun County. Its fee schedule prices a mechanical permit for adding, replacing or relocating central heating and air conditioning in a house, and its Department of Building and Development issues permits in the Town of Leesburg too. The gas furnace gets a gas permit; since October 2025 one replaced at the same input rating in the same place needs no plans.
Yes. Close to three owner homes in ten in town heat with electricity, which here usually means a heat pump and an air handler rather than a furnace. 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 Leesburg 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.