Furnace replacement in Marshall.
A new furnace in Marshall runs $4,285 to $14,040 installed, keeping the cooling you have. Out here the new one usually burns propane, not natural gas.
- Installed price in writing
- Sized to the house, not the old nameplate
- Dedicated HVAC team
Get your furnace priced in writing
In Marshall a furnace swap means propane, a tank in the yard and a Fauquier County permit.
Natural gas barely figures in 20115: the Census counts 8 owner homes heating with it, against 424 on propane. So a Marshall furnace replacement usually means propane for propane, fed from a tank on the property. A new furnace arrives built for natural gas, and a conversion kit swaps its burner orifices and the spring in its gas valve before the first fire.
The price assumes your cooling stays, and in a Marshall propane house that’s often a heat pump, which carries the mild months, racks up the hours and is often the half already replaced. The new furnace has to suit the coil sitting on top of it and that coil’s rated airflow, so the quote should name the outdoor unit’s model too.
Most of these furnaces live in houses from 1970 to 1999: the Census counts 532 homes here from the 1970s, 605 from the 1980s and 511 from the 1990s. On the newer streets north of Main and the cul-de-sacs west of Rectortown Road, a furnace original to the house would be pushing thirty or well past it. Read the date on yours; late 1990s or early 2000s means price it this fall.
Marshall has no town government, so a new furnace answers to Fauquier County alone. The County treats any fuel-fired appliance as permit work, even in the old one’s exact spot, and its Department of Community Development on Courthouse Square in Warrenton issues trade permits over the counter the day the application arrives. Test the carbon monoxide alarm on that floor on install day; Fauquier Fire Rescue takes alarm requests through its public education page.
Marshall houses, by the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
Marshall
ZIP 20115 as a whole: every Marshall address, the village included. The Census place for the village alone has too few homes for steady figures.
- Median home built1986 Census
- Built before 1980about 4 in 10 Census
- Built since 2000about 2 in 10 Census
- Most homes aresingle-family houses, about 8 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 Marshall.
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 Marshall.
It backs up a wood stove and it’s older than you think
Wood is the main heat in about one Marshall owner home in thirteen, often with a propane furnace standing by. One that only runs when the stove is out can look fine at thirty while its parts go out of production. If it struggles on its first start of the season, get it priced.
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 Marshall.
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 Marshall.
Questions to ask anybody who quotes you, us included.
Did they ask what else heats the house?
Around Marshall a furnace often splits the work with a heat pump or a wood stove. That changes the right size, and how the thermostat hands off between them.
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.
Thank you very much for the great work. The HVAC installation, turned out perfectly. I will recommend SwiftPro service to people I know.
5.0 stars across 884 Google reviews. Read them on our reviews page.
Furnace replacement questions from Marshall.
My propane tank only runs the furnace. Should I switch to a heat pump instead?
Price both. Close to two Marshall owner homes in three already heat with electricity, so it’s a familiar switch here, and with nothing else on the tank a heat pump system could retire it. The HVAC replacement cost estimator prices both for your house.
What changes when the furnace in an old village house is replaced?
Often the venting. On Anderson Avenue or West Main Street an older furnace may vent up a masonry chimney, while a high-efficiency one vents out a side wall in plastic pipe. If a propane water heater shares that chimney, the written price should say how it vents afterward.
How much does a new furnace cost in Marshall?
$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 Marshall.
More from SwiftPro in Marshall
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 Marshall 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.