Open 24/7 for emergencies
A new propane furnace in Catlett runs $4,285 to $14,040 installed, keeping your AC or heat pump. The Census finds no natural gas heat in 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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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 Catlett
Of the 1,040 owner homes in ZIP 20119, the Census counts 301 heating with propane and not one on a utility gas line, so a furnace replacement in Catlett is a propane furnace replacement. The new one gets converted from the factory’s natural gas setting to run on your tank, and the line gets a leak check before it ever lights.
Warrenton 3 SE, the nearest NOAA normals station, averages a January low near 25 degrees and about 98 nights a year at or below freezing, and Fauquier County’s building code designs heating for a 17 degree day. Then come the outliers: 3 degrees there on January 7, 2014, 2 on February 20, 2015, and wind chills of 0 to 10 below across the Piedmont in late January 2026. A furnace that gets by on a 25 degree night shows its age on those.
The typical owner home across the ZIP dates from 1990, with 270 houses from the 1990s and 201 from the 2000s, and a propane furnace original to either is due a hard look. The 179 houses from before 1940, in the old railroad village and on the farms around it, have usually been through several furnaces, and the one there now may be wedged into a crawlspace or a closet the new one has to fit through too.
Wood is the other heat here: the Census counts 131 Catlett owner homes that list it as their main heat. In plenty of those the propane furnace is the backup, carrying the house when the stove burns down overnight or nobody’s home to feed it. It runs fewer hours, but its parts age by the calendar all the same.
By the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
ZIP 20119 as a whole: every Catlett address, the village included. The Census place for the village alone has too few homes for steady figures.
When it’s time
Cedar Run crested at 18.2 feet at the Catlett gauge in July 2013, its third highest on record. A furnace whose gas valve or control board sat in water needs those parts replaced even if it lights afterward. Don’t relight it yourself; call us to check it all. The $99 diagnostic visit tells you whether it’s parts or the whole furnace.
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.
That’s the winter design temperature in Fauquier County’s building code. Ask what heat loss they worked out for your house at 17 degrees. A quote with no number behind it is a copy of whatever was there before.
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.
I would highly recommend SwiftPro for an HVAC replacement. The sales process was straightforward and fair and the installation was done to my satisfaction in a timely and complete manner (and I’m pretty demanding). Great job!
Where we work
Next door to Catlett: Calverton, Casanova, Midland, Nokesville and Bristow.
Questions
No owner home in ZIP 20119 heats with utility gas, the Census says. A furnace here runs on propane, so the tank’s owner, you or your propane company, should hear about the new furnace first, and the quote should say whether the line from the tank is big enough.
Yes, if it’s the only other heat and it’s failing a safety check or past its years: it keeps the pipes from freezing on a 3 degree night when the stove is cold. The HVAC replacement cost estimator also prices a heat pump system.
$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 Catlett 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.