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Furnace and AC replacement in Sterling runs $8,898 to $23,000 installed. Over half of Sterling’s homes date from 1980 to 1999, and their systems age as a set.
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 Sterling
More of our Sterling calls end in a full system replacement than in any other town where we work regularly. The Census helps explain it. Over half the homes across Sterling’s Census places went up from 1980 through 1999, and the typical owner home around Sterling Park dates from 1979, against 2003 for Loudoun County as a whole. Sterling is a generation older than the county around it, and most of it was built inside one twenty-year stretch.
That timing shapes the job. A Sugarland Run house, typical owner home from 1983, or a Cascades or Lowes Island one from 1996, has usually been through its builder’s furnace and air conditioner already. Where the second pair went in together, often in the 2000s, both halves have now run close to twenty years side by side, and one big repair on either is the cue to price both.
The pair isn’t always a furnace and an air conditioner. Countryside heats mostly with electricity, nearly eight owner homes in ten, and around Sterling Park just over half, which here usually means a heat pump outside and an air handler with backup strips inside; that whole system runs $8,499 to $21,650 installed. Cascades and Lowes Island have the classic pair, a gas furnace with an air conditioner out back.
Size gets a fresh look. Lowes Island is mostly detached houses, and the bigger ones often run a second system for the bedrooms, each priced on its own. A Sugarland Run house may have gained a finished basement since its first system was sized. Loudoun County handles the paperwork, since Sterling has no town hall: a mechanical permit for the equipment, and a separate gas permit for a gas furnace.
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 |
|---|---|---|---|---|
| Sterling | 1979 | single-family houses, about 5 in 10 | electricity, about 5 in 10 | Mostly electric heat, so usually a heat pump swap instead. |
| Lowes Island | 1996 | single-family houses, about 6 in 10 | gas, about 7 in 10 | Townhouse systems: a furnace in a closet or attic, the air conditioner out back. |
| Cascades | 1996 | townhouses, about 4 in 10 | gas, about 8 in 10 | 1980s and 90s houses, most on their second furnace and AC. |
| Sugarland Run | 1983 | single-family houses, about 6 in 10 | gas, about 5 in 10 | 1980s and 90s houses, most on their second furnace and AC. |
| Dulles Town Center | 1998 | condo and apartment buildings, about 5 in 10 | gas, about 9 in 10 | Condo closet systems: small units, often with association rules for the outdoor half. |
| Arcola | 2017 | townhouses, about 5 in 10 | gas, about 8 in 10 | Townhouse systems: a furnace in a closet or attic, the air conditioner out back. |
| Oak Grove | 2005 | townhouses, about 8 in 10 | gas, about 9 in 10 | Townhouse systems: a furnace in a closet or attic, the air conditioner out back. |
By the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
When it’s time
The label on the outdoor unit and the one inside the furnace door each carry a date. If both land in the same few years of the 2000s, the pair has worked close to twenty Sterling winters and summers together, and when one needs a compressor or a heat exchanger, the other usually isn’t far behind.
Where a lot of homes heat with electricity, the indoor half is often an air handler, and the like-for-like swap is a heat pump system, $8,499 to $21,650 installed.
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.
In Sugarland Run and around Sterling Park, neighbors on one street often heat different ways. With a gas line in, ask for three lines on one page: a furnace and air conditioner, a heat pump system, and a heat pump paired with a gas furnace. Our dual fuel guide explains the third.
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.
Oscar and Ndung were great technicians for our HVAC install! Very knowledgeable and friendly. Would recommend them to others!
Where we work
Next door to Sterling: Ashburn, Herndon, Reston, Great Falls and Chantilly.
Questions
No. NOAA’s normals for Dulles Airport, next to Sterling, count about 33 days a year at 90 degrees or hotter, fewer than Reagan National’s 40. An oversized air conditioner cools the house fast and shuts off before it has pulled the moisture out, so the rooms feel clammy. The new one gets sized to the house, not to the hottest afternoon of the year.
$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 Sterling 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.