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Furnace and AC replacement in Round Hill runs $8,898 to $23,000 installed. Here the pair is usually a heat pump and air handler, or a propane furnace and AC.
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 Round Hill
NOAA’s normals for the Purcellville station, about three miles east-northeast of town, put heating degree days near 4,940 a year and cooling degree days near 1,050, so by degree days the area heats nearly five times as much as it cools, and the station logs fewer cooling degree days than Dulles Airport’s 1,230. Cool summers are an old draw: Virginia’s historic register says the village became a vacation spot for people escaping Washington’s summer heat.
So sizing here starts with the winter load, then checks the summer one. Summer still bites. The Purcellville station’s normal year brings 30 days that reach 90, and on July 28, 2023, the heat index topped 110 at numerous western Loudoun mesonets.
What the pair is depends on the fuel. Of the ZIP’s 2,362 owner homes, 953 heat with propane, so a furnace and AC there means a propane furnace inside and, out back, either an air conditioner or a heat pump: $8,898 to $23,000 installed for the two. The 1,257 all-electric homes have an air handler where a furnace would sit, and their like-for-like swap is a heat pump system, $8,499 to $21,650.
The Town’s utility plan describes very rapid growth from the mid 1990s through 2005, and the project its developers built around the town ran to roughly 1,200 homes. A pair set in one of those houses is twenty to thirty years old now, and if the outdoor half predates 2010, its label most likely says R-22.
By the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
ZIP 20141 as a whole: every Round Hill address, the Town and the neighborhoods around it. The Census place for the Town alone has too few homes for steady figures.
When it’s time
Quarter-size hail fell in Round Hill on July 25, 2023, and a June 2016 thunderstorm uprooted numerous large trees along New Cut Road, Bell Road and Main Street. Flattened fins or a dented cabinet on a twenty-year-old outdoor unit is usually the time to price the pair. After a storm, look it over before running it, and call us if anything’s bent.
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.
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.
Choosing who installs it
Ask every company that quotes the job, us included.
Here heating outweighs cooling nearly five to one by degree days. Ask whether the load calculation used a western Loudoun winter, and whether the quote names the backup heat, propane furnace or electric strips, and the outdoor temperature where it takes over.
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.
Moises and Oscar did a superlative job doing a custom installation of a new HVAC unit in a tight basement space. And they then took the time to go over system operation. Top tier job and service in all respects!
Where we work
Next door to Round Hill: Purcellville, Bluemont, Philomont, Hamilton and Middleburg.
Questions
Loudoun County, for every address in 20141, the town included. Its fee schedule lists replacing central heating and air conditioning as permit work, and a propane furnace also takes a fuel gas permit, with no plans needed since October 1, 2025 when the BTUs and location stay the same. Inside the town limits, the Town’s zoning permit covers new work such as an addition.
The propane furnace comes out and an air handler with electric backup strips takes its place, with a heat pump outside; that system runs $8,499 to $21,650 installed. Those strips draw a lot of power, so the electrical panel gets checked before the price is final. If the propane supplier owns the tank, removing it is between you and them.
$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 Round Hill 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.