Furnace and AC replacement in Hamilton.
Furnace and AC replacement in Hamilton runs $8,898 to $23,000 installed. Piped gas is rare here, so the new furnace will almost always burn propane.
- Your price range up front
- Sized to the house, not the old label
- Dedicated HVAC team
Get your new system priced
Hamilton’s summer storms bring trees down, and its builder systems are reaching twenty.
The Purcellville weather station, 2.6 miles west-northwest of Hamilton, averages 30 days a year at 90 degrees or more, and July’s average low there, 65.5, means the nights still cool off. That rewards an air conditioner sized to the house, not oversized: a big unit cools fast, shuts off before it pulls the damp out, and leaves the rooms clammy.
Hamilton’s storms come with trees. On July 25, 2010, thunderstorm winds estimated at 57 knots left at least thirty trees down across Hamilton, the fire department reported. On July 21, 2019, winds estimated at 61 knots damaged a roof in the 39000 block of Meadowlark Drive and put trees down between town and the Route 9 and Route 704 intersection, a road Tropical Storm Irene’s fallen trees closed in 2011. A limb through the top of a twenty-year-old outdoor unit usually ends the repair conversation.
Fuel decides the pair. In the 373 owner homes on propane, it’s a furnace burning propane with an air conditioner or heat pump outside, $8,898 to $23,000 installed for both. The 665 all-electric homes have an air handler with backup strips instead, and their matching swap is a heat pump system, $8,499 to $21,650. If the outdoor unit is newer than the furnace, it may be the furnace alone at $4,285 to $14,040.
The Census dates 386 homes in 20158 to the 2000s and 271 to the 2010s, so the first builder pairs have passed twenty years, and an outdoor unit set before 2010 most likely runs on R-22. The 303 from the 1970s often keep their first ductwork, so measure it before sizing a new pair.
Hamilton houses, by the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
Hamilton
ZIP 20158 as a whole: every Hamilton address, the Town and the countryside around it. The Census place for the Town alone has too few homes for steady figures.
- Median home built1988 Census
- Built before 1980about 4 in 10 Census
- Built since 2000about 4 in 10 Census
- Most homes aresingle-family houses, about 9 in 10 Census
- Heated withelectricity, about 5 in 10 Census
- Rentedabout 2 in 10 Census
- A few homes still burn heating oil. We don’t work on oil burners, but a switch to a heat pump or a gas or propane furnace is ours to price.
- Electric heat here usually means a heat pump with backup strips, which is priced as a heat pump system, not a furnace and AC.
What a new furnace and AC costs in Hamilton.
$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 Hamilton.
The storm passed and the AC won’t start
Shut it off at the thermostat and walk out to the unit first. Look for bent fins, a dented top, a limb on the line set or a disconnect box knocked loose, and call us to check it all before it runs. If the unit has seen twenty summers, we’ll price the repair and the pair side by side.
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 Hamilton.
Ask every company that quotes the job, us included.
Did they work out what the house needs in July, or copy the old label?
A house on an open rise and one under big trees cool differently, and a finished basement changes the math. Ask whether the quote came from a load calculation on your house as it is now.
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.
Hard working crew that removed old system and installed new system in a professional manner.
5.0 stars across 884 Google reviews. Read them on our reviews page.
Furnace and AC replacement questions from Hamilton.
Does the Town of Hamilton issue the permit for a new furnace and AC?
No, Loudoun County does, inside the town limits and out. Its fee schedule lists adding, replacing or relocating 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.
Should we price the pair before either one fails?
If both are original to a 2000s house, yes. Chosen in the fall, a system gets measured and compared; chosen the morning after a July storm, it gets picked in a hurry. The HVAC replacement estimator gives your range first, and if a repair turns up instead, a diagnostic visit costs $99.
How much does a new furnace and AC cost in Hamilton?
$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.
Furnace and AC replacement in the towns next door.
- Furnace and AC replacement in Paeonian Springs
- Furnace and AC replacement in Waterford
- Furnace and AC replacement in Purcellville
- Furnace and AC replacement in Leesburg
- Furnace and AC replacement in Lovettsville
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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 Hamilton 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.