Furnace replacement in The Plains.
A new propane furnace in The Plains runs $4,285 to $14,040 installed, keeping your cooling. Ours are sized to Fauquier’s 17 degree design night.
- Installed price in writing
- Sized to the house, not the old nameplate
- Dedicated HVAC team
Get your furnace priced in writing
Propane, a 17 degree design night and a historic district: replacing a furnace in The Plains.
Natural gas is rare in 20198. Of the ZIP’s 589 owner homes, the Census counts 16 heating with utility gas and 134 with propane, so a furnace replacement here nearly always means a propane furnace fed from a tank on the property. If the propane company owns the tank, give them the install date; the supplier may want to check the line and the regulator while we work.
Fauquier County sizes heating equipment to a winter design temperature of 17 degrees. NOAA’s normals station about 12 miles south, near Warrenton, averages a January low just under 25 and close to five nights a year at 10 or colder. The new furnace gets sized from a room by room heat loss calculation, not copied off the old label.
The ZIP built in waves: about 190 homes in the 1980s, the decade that puts 20198’s median owner home at 1983, and about 285 more since 2000. A furnace that came with a 2000s house is around twenty now, about when most start needing something every winter.
Storms out here take the power with them. NOAA’s storm records list numerous trees down on Bunker Hill Road in July 2022, and dozens of trees and wires along Halfway Road and The Plains Road in August 2023. A propane furnace still needs electricity for its blower, igniter and control board, so if you run a generator, ask whether the new furnace is meant to run on it, on a circuit the transfer switch carries.
The Plains houses, by the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
The Fauquier County side
ZIP 20198 as a whole, the Town included: its own homes are too few for steady Census figures.
- Median home built1983 Census
- Built before 1980about 5 in 10 Census
- Built since 2000about 3 in 10 Census
- Most homes aresingle-family houses, about 9 in 10 Census
- Heated withelectricity, about 6 in 10 Census
- Rentedabout 3 in 10 Census
- Propane heats a real share of homes here, and we replace propane furnaces too.
- Most homes here heat with electricity, usually a heat pump; a furnace swap here is for the gas and propane houses.
What a new furnace costs in The Plains.
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
- A furnace and air conditioner together, installed$8,898 to $23,000
- Repair diagnostic visit, if it may be worth fixing$99
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.
When a new furnace makes sense in The Plains.
It lost ground in last winter’s cold snaps
The late January 2026 Arctic outbreak brought Extreme Cold Warnings to northern Fauquier, and a station listed as The Plains logged a wind chill of minus 6 on February 1. A furnace that ran nonstop those nights and still let the house cool off is undersized or worn out.
You heat with propane
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.
The heat exchanger is cracked
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.
Who signs off on a new furnace in The Plains.
Fauquier County
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.
How to pick the best furnace replacement company in The Plains.
Questions to ask anybody who quotes you, us included.
Where will the new vent come out, and how high?
A high-efficiency furnace usually vents out a side wall in plastic pipe, and that pipe has to stay above the snow: the January 2016 blizzard left an estimated 24 to 36 inches across northern Fauquier, and a furnace that can’t exhaust shuts itself off. In town, a new pipe on a wall facing the street may also need the Architectural Review Board’s look first.
Did they size it to your house?
Ask how they picked the size. Copying the old nameplate repeats whatever was guessed when the house was built.
Did they check the air conditioner you’re keeping?
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.
Will they tell you if it’s worth fixing?
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.
What our customers say.
We used Swifpro for a new hvac install and a plumbing repair. We felt the pricing for the hvac install was fair and offered a better product than their competitors. The techs were professional and timely.
5.0 stars across 884 Google reviews. Read them on our reviews page.
Furnace replacement questions from The Plains.
Does the Town of The Plains issue the furnace permit?
No. Fauquier County does the building inspections for the Town and wants a trade permit for any fuel-fired appliance, propane included, even in the old furnace’s exact spot. Trade permits usually need no zoning approval, so the Town comes into it when the outside of the house changes.
Should a heat pump take over from the propane furnace instead?
Price both. About six in ten 20198 homeowners already heat with electricity. Keeping the propane furnace as the backup to a new heat pump is the middle road: the heat pump carries the mild days, and the furnace takes the colder of the roughly 98 nights a year at or below freezing. The HVAC replacement cost estimator prices each.
How much does a new furnace cost in The Plains?
$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.
Should I repair it or replace it?
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.
More from SwiftPro in The Plains.
More from SwiftPro in The Plains
The range first, then your number.
Call, or book online and pick a window. 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 is a licensed, BBB Accredited (A rating), independently owned heating, cooling and plumbing company in Chantilly, serving The Plains 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.