Furnace and AC replacement in Round Hill.
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.
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Round Hill heats far more than it cools, and its builder pairs are aging out together.
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.
Round Hill houses, by the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
Round Hill
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.
- Median home built2004 Census
- Built before 1980about 2 in 10 Census
- Built since 2000about 6 in 10 Census
- Most homes aresingle-family houses, about 9 in 10 Census
- Heated withelectricity, about 5 in 10 Census
- Rentedabout 1 in 10 Census
- Electric heat here usually means a heat pump with backup strips, which is priced as a heat pump system, not a furnace and AC.
- Many houses here still run the builder’s furnace and AC, and the two tend to wear out together.
What a new furnace and AC costs in Round Hill.
$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
- Furnace alone, keeping your AC$4,285 to $14,040
- Heat pump system instead$8,499 to $21,650
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.
When replacing both makes sense in Round Hill.
Hail or a falling limb hit the outdoor unit
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.
Your heat may not be a furnace
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.
Both halves went in with the house
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.
How to pick who replaces your furnace and AC in Round Hill.
Ask every company that quotes the job, us included.
Will they size it for January, not just July?
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.
Do they size it to the house, or copy the old label?
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.
Is the whole job in the written price?
Furnace, outdoor unit, matching coil, refrigerant lines, thermostat, permit and hauling the old one away. If it isn’t on the paper, ask.
Already holding another company’s quote?
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.
What our customers say.
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!
5.0 stars across 884 Google reviews. Read them on our reviews page.
Furnace and AC replacement questions from Round Hill.
Who issues the permits for a new system in Round Hill?
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.
We want to drop propane and go all-electric. What changes?
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.
How much does a new furnace and AC cost in Round Hill?
$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.
Do I have to replace both at the same time?
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.
More from SwiftPro in Round Hill.
More from SwiftPro in Round Hill
Start with your number, then a written quote.
Call, book online, 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 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 884 Google reviews. SwiftPro maintains a dedicated HVAC team and a dedicated plumbing team.
SwiftPro Heating, Cooling & Plumbing, 4230 Lafayette Center Dr, Suite N, Chantilly, VA 20151, (703) 997-9757. Book online, read our reviews, or see every town we serve.