Open 24/7 for emergencies
Furnace replacement in Philomont: $4,285 to $14,040 installed, for a propane furnace as readily as a natural gas one.
Price range
$4,285-$14,040
8yrs @ 7.99%
$61/mo
15yrs @ 9.99%
$46/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
Two of our heating technicians beside a gas furnace, the cooling coil on top of it and the water heater to the right.
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
The same price book our estimator runs on, for a gas furnace on its own, 2 to 5 tons, keeping the air conditioner you have. A single-stage furnace in a small house sits near the bottom; a modulating one in a big house, near the top.
A gas furnace alone, keeping your air conditioner, installed
$4,285 to $14,040
or $71/mo at 0% APR for 60 months
A furnace and air conditioner together, installed
$8,898 to $23,000
or $148/mo at 0% APR for 60 months
Repair diagnostic visit, if it may be worth fixing
$99
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 cost estimator narrows it to your house. Then a tech measures, and you get the installed price in writing, at no charge, before anything is ordered.
Natural gas or propane, in a house, a townhouse or a condo, we replace them all. Oil furnaces we don’t.
What’s different in Philomont
Propane warms about 42 percent of owner homes in the Purcellville ZIP area that Philomont’s Census numbers come from, against about 6 percent for natural gas. So a new furnace here is more often a propane furnace than a gas one. $4,285 to $14,040 is the installed range for either, 2 to 5 ton, keeping the air conditioner you have, and the HVAC replacement cost estimator at goswiftpro.com/estimator narrows it to your house.
The median owner home in that ZIP area dates to 2000, so a furnace original to it is well into its third decade, past the years most are retired. Nearly three in ten homes date from 1980 through 1999, and roughly a quarter predate 1980. In houses like those the furnace may be older than the air conditioner beside it, which is the case a furnace on its own suits best.
Winters set the stakes. The Purcellville station counts 4,942 heating degree days a year and 114.7 days with lows at or below 32F, and the coldest nights of the January 2026 arctic outbreak fell under Extreme Cold Warnings. A furnace that fails in that stretch leaves a house that cools fast. The median spring date of the last 32F low is April 16 and the fall’s first is October 25, which bracket the mild weeks for planning a swap.
Permits come into it. Loudoun County asks for one when a gas furnace is swapped, and since October 2025 it has skipped plan review for a like-for-like replacement, same BTUs and same location. Read the input rating off the old nameplate, then ask for the new one’s, and compare the two. Oil heats about 6 percent of owner homes in the ZIP area. That burner is one we won’t touch, though trading oil for propane or a heat pump is a job we can price.
By the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
Philomont’s own ZIP, 20131, is post office boxes only, so the Census Bureau maps no area for it. These are ZIP 20132 as a whole, the Purcellville ZIP area Philomont sits in, the Town of Purcellville included.
When it’s time
Cycles that stretch on while the house trails the thermostat, in a home from around the 2000 median year, point to a furnace near the end of its years or a duct problem. The diagnostic visit is $99, and it sorts out which one before anyone shows you a replacement price.
A house from the 2000s often runs the furnace it was built with. Around twenty years, inducer motors and control boards start to go, one after another.
We replace propane furnaces as well as natural gas ones. The new furnace is set up for propane before it’s lit, and the quote is written for your house.
Permits, locally
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
Questions to ask anybody who quotes you, us included.
A propane furnace has to be set up for propane, and its tank and regulator are usually your supplier’s. Ask who connects the gas line, who handles the conversion and whether the quote lists the venting, so the day goes the way the paper says.
Ask how they picked the size. Copying the old nameplate repeats whatever was guessed when the house was built.
A new furnace has to work with the coil and the outdoor unit already there. Ask whether they looked at both before quoting a furnace on its own.
A good company puts the repair price next to the replacement range and lets you choose. Already holding somebody’s big number? Take the free second opinion first.
Two of our crew going over a work order before the day's calls.
From our Google reviews
5.0 stars across 1,132 reviews. Read them on our reviews page.
Hard working crew that removed old system and installed new system in a professional manner.
Where we work
Next door to Philomont: Middleburg, Round Hill, Bluemont, Purcellville and Hamilton.
Questions
Oil burners are not something we install or fix. Since propane and electricity each heat about 42 percent of owner homes in the ZIP area, the usual way out is a propane furnace or a heat pump, and both are ours to quote. For a furnace alone, with your AC staying, the range is $4,285 to $14,040 installed.
Start with the diagnostic visit at $99. The repair gets a price before work starts, and you can set it beside the $4,285 to $14,040 range. At that age the choice usually depends on what failed: a small part is worth fixing, and a failing major part is a conversation about the whole furnace.
$4,285 to $14,040 installed for a gas furnace on its own, keeping the air conditioner you have; size and efficiency set where yours lands. A furnace and air conditioner together run $8,898 to $23,000. The HVAC replacement cost estimator gives your house its own number.
Fix the small parts on almost any furnace. Past fifteen years, with a repair over a third of the price of a new one, replacing usually wins. Not sure which you’re looking at? The diagnostic visit is $99, and the tech prices the repair before starting it.
Ready when you are
Call, or send the form at the top. A tech measures the house and puts the installed price in writing before anything is ordered, and if the old furnace is worth fixing, 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 Philomont 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.