Furnace replacement in Dumfries.
Replacing just the furnace in Dumfries runs $4,285 to $14,040 installed, AC kept. Gas here comes from two companies or a yard tank, so start with your bill.
- Installed price in writing
- Sized to the house, not the old nameplate
- Dedicated HVAC team
Get your furnace priced in writing
Two gas companies, propane tanks and old chimneys behind Dumfries furnaces.
A furnace on its own is a job for the gas side of Dumfries. Inside the Town, the Census counts 598 of the 1,375 owner homes on natural gas and 81 on propane; the other 696 heat with electricity, mostly through heat pumps. The Town’s utility list names two gas companies, Columbia Gas and Washington Gas, and which one runs your line matters once a new furnace is on the table.
Propane matters more inside the town line than around it: those 81 Town owner homes compare with fewer than one owner in a hundred in Montclair. A propane furnace usually leaves the factory set for natural gas and gets converted with the kit its maker specifies, new burner orifices and a new gas valve setting, before its first light. The tank and its regulator are usually the propane supplier’s to look after.
The townhouse rows are their own job. Town records put Williamstown, the largest at about 455 homes, at 1974 through 1991 and South Cove at 1988 through 1992. A gas furnace in one of those units usually sits in a closet or the attic, and a middle unit has no side wall of its own, so a high-efficiency replacement’s two plastic pipes have to leave through the roof or the front or back wall. Where those pipes can go decides which furnace fits, and it’s settled before the quote is.
Out past the town line, Cherry Hill’s builder furnaces are aging: more than half its homes went up since 2000, and seven owners in ten heat with gas. In the Town, older single-family streets like Tripoli Heights and Whitehaven go back to 1950 and 1930, and a furnace there may still vent up a masonry chimney. A high-efficiency one vents through a wall in plastic pipe instead; in the Town’s historic district, run that new opening past the zoning administrator first.
The furnaces across Dumfries, place by place.
Census figures for the owner-occupied homes in each place, and what that usually means for the furnace that’s there now.
| Place | Median home built | Most homes are | Heated with | The furnace there now |
|---|---|---|---|---|
| Montclair | 1989 | single-family houses, about 8 in 10 | electricity, about 5 in 10 | Mostly electric heat; gas furnaces are the minority. |
| Cherry Hill | 2005 | townhouses, about 4 in 10 | gas, about 7 in 10 | Townhouse furnaces in closets and attics. |
| Dumfries | 1985 | townhouses, about 4 in 10 | electricity, about 5 in 10 | Mostly electric heat; gas furnaces are the minority. |
Dumfries houses, by the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
The Town of Dumfries
Nearly all of the Town sits in 22026, with a sliver in Triangle’s 22172. None of it is in 22025.
- Median home built1985 Census
- Built before 1980about 4 in 10 Census
- Built since 2000about 1 in 10 Census
- Most homes aretownhouses, about 4 in 10 Census
- Heated withelectricity, about 5 in 10 Census
- Rentedabout 2 in 10 Census
- Most homes here heat with electricity, usually a heat pump; a furnace swap here is for the gas and propane houses.
- Townhouse furnaces sit in closets and attics, so the new one has to fit the same space and the same way in.
The Prince William County side
Montclair in 22025, where the Postal Service accepts Montclair as the town name; Southbridge and Cherry Hill in 22026, outside the town line.
ZIPs 22025 and 22026 as a whole: Montclair, Cherry Hill and the rest of Dumfries mail, the Town’s homes included.
What a new furnace costs in Dumfries.
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 Dumfries.
The air conditioner is younger than the furnace
Outdoor units take the summer’s worst and often quit first. If yours was replaced in the last ten years and cools well, a furnace-only job keeps it, with the new blower set for the coil it was matched to.
It’s still the builder’s furnace
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.
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 Dumfries.
Town of Dumfries
The Town of Dumfries enforces Virginia’s statewide building code through its own building department, and that code exempts swapping a home’s mechanical appliance only when it isn’t fueled by gas or oil. Inside the town limits, a gas or propane furnace or water heater replacement is permit work at Town Hall, not Prince William County. Source.
Prince William County
Prince William County requires a permit to replace a gas or propane furnace or a gas appliance such as a water heater, even like for like. Replacing an electric water heater with one the same size in the same spot needs no permit. Source.
How to pick the best furnace replacement company in Dumfries.
Questions to ask anybody who quotes you, us included.
Did they price what the old chimney is left doing?
Where a furnace shares a masonry chimney with the water heater, taking the furnace off it can leave the flue too big for the water heater alone, and an oversized flue can draft poorly. Ask whether the quote covers a liner or a new vent for the water heater, in writing.
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.
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!
5.0 stars across 884 Google reviews. Read them on our reviews page.
Furnace replacement questions from Dumfries.
Which gas company serves my Dumfries house?
Your bill says. The Town of Dumfries lists both Columbia Gas and Washington Gas, so the address alone won’t settle it. It matters because Washington Gas pays a rebate on a new furnace rated 95.1 percent efficient or better, and only to its own customers.
Do you replace propane furnaces in Dumfries?
Yes, propane or natural gas. The HVAC replacement cost estimator gives a first number, and the written price follows a look at the furnace, its venting and the gas line to it.
How much does a new furnace cost in Dumfries?
$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 Dumfries.
More from SwiftPro in Dumfries
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 Dumfries 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.