Open 24/7 for emergencies
A new propane furnace in Calverton runs $4,285 to $14,040 installed, keeping your AC or heat pump. The Census counts no natural gas heat in ZIP 20119.
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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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 Calverton
Calverton’s own ZIP is post office boxes, so the houses carry Catlett or Midland mail, and natural gas heats almost nothing in either. Across Catlett’s 20119 the Census finds 301 owner homes burning propane and not one on utility gas; in Midland’s 22728, 354 on propane against 12 on gas. So a furnace replacement here is nearly always propane in, propane out, fed from the tank on your lot.
Fauquier County’s code table sets the winter design temperature at 17 degrees, the figure a load calculation sizes the heat against. The nearest NOAA normals station, Warrenton 3 SE about six miles west, averages a January low of 24.8 and close to a hundred nights a year at or below freezing, and it read 3 degrees in January 2014. A furnace copied off the old nameplate either short cycles in the mild weeks or falls behind on a morning like that.
The County’s plan describes an extensive floodplain through the middle of the village, and the NCEI storm record has high water closing or blocking Bastable Mill Road four times between 2014 and 2024, once at Turkey Run and twice near Brookfield Drive. If a heavy rain ever put water in your cellar or crawlspace deep enough to reach the furnace, its maker’s warning is plain: don’t use it, and replace every gas control and control part that sat in the water. On an older furnace, that tips the decision toward a new one.
A propane furnace only heats through an outage if it has power: the igniter, the inducer and the blower all run on electricity. An August 2024 thunderstorm blew numerous trees down near Calverton, and wires come down with trees. If you run a generator, tell us at the measuring visit.
By the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
Calverton’s own ZIP, 20138, is post office boxes only, so the Census Bureau maps no area for it. These are ZIP 20119 as a whole, the Catlett ZIP area that holds nearly nine in ten of the Calverton Census place’s homes.
When it’s time
After a storm floods the cellar, look at the furnace before you touch the thermostat. If water reached the burners, the gas valve or the control board, don’t relight it. Call us after the storm and we’ll check it all. Past fifteen years, it’s usually a new one, $4,285 to $14,040 installed.
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.
It’s the wall that keeps the burner’s exhaust out of the air the furnace blows through the house. Nobody patches one; a crack ends the repair conversation.
Permits, locally
Fauquier County wants a permit for any fuel-fired appliance, so a gas or propane furnace replacement is permit work even in the same spot. Trade permits need no plans, and usually no zoning approval. 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.
Ask what outdoor temperature their load calculation used. Fauquier’s code table says 17 degrees. A quote that can’t name a number was a guess.
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.
SwiftPro came today to install our new HVAC system and they were fantastic. They were super courteous and well organized and kept the whole place clean and tidy the entire time. The price was reasonable and the whole experience was amazing. Highly recommend them!
Questions
Plenty of houses here already went that way: 526 of the 1,040 owner homes in ZIP 20119 heat with electricity, mostly by heat pump. If your propane furnace is sound, a heat pump can take the mild days and leave the hard freezes to the furnace. The HVAC replacement cost estimator prices both for your house.
Usually. Furnaces built to lie on their side are made for crawlspaces, and the tech checks the clearances, the vent route and the way in. If water has ever come into that crawlspace, tell us, and the new one gets set up off the floor.
$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 Calverton 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.