Furnace replacement in Annandale.
Furnace replacement in Annandale runs $4,285 to $14,040 installed, with your air conditioner left in place. Gas heats about seven in ten owner homes in 22003.
- Installed price in writing
- Sized to the house, not the old nameplate
- Dedicated HVAC team
Get your furnace priced in writing
Gas furnaces on Annandale’s lowest floors, and air conditioners that outlived them.
Across 22003 gas heats about seven in ten owner homes, and closer to eight in ten in Wakefield, the Census place that takes in Canterbury Woods and Wakefield Chapel Road. The median owner home went up in 1967 in the Annandale Census place and in 1968 in Wakefield and Woodburn. A gas furnace usually lasts fifteen to twenty years, so a house that age is likely on its third or fourth.
The air conditioner rarely keeps the same calendar. An outdoor unit that quit in a July heat wave got replaced that summer, while the furnace downstairs kept going. That’s how a house ends up with a condenser outside that has years left and a furnace downstairs that’s finished: the job this price is for. The new blower has to push the airflow your coil and condenser were built for, so we read the outdoor unit’s label and look at the coil before quoting.
Getting the old one out is usually the easy part here. In a rambler the furnace stands in the basement; in a split-level it’s on the lowest floor, often behind a door off the family room. A high-efficiency replacement asks for two things that room may not have: a spot on an outside wall for its plastic vent pipes, and somewhere for the water it makes to go. A floor drain close by keeps that simple. Without one, a small condensate pump carries it off.
Propane is rare in Annandale, under one owner home in a hundred, and we replace those furnaces too, converted to burn propane before the first fire.
The furnaces across Annandale, 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 |
|---|---|---|---|---|
| Annandale | 1967 | single-family houses, about 5 in 10 | gas, about 7 in 10 | Gas furnaces on their second or third round, often on a chimney shared with the water heater. |
| Wakefield | 1968 | single-family houses, nearly all | gas, about 8 in 10 | Gas furnaces on their second or third round, often on a chimney shared with the water heater. |
| Woodburn | 1968 | single-family houses, about 4 in 10 | gas, about 6 in 10 | Gas furnaces on their second or third round, often on a chimney shared with the water heater. |
Annandale houses, by the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
Annandale
- Built before 1980about 8 in 10 Census
- Built since 2000about 1 in 10 Census
- Most homes aresingle-family houses, about 5 in 10 Census
- Heated withgas, about 7 in 10 Census
- Rentedabout 3 in 10 Census
- Houses this age are often on their second or third furnace, still blowing through the original ducts, and the new one has to suit them.
- Most heat here is gas, so the usual job is gas furnace for gas furnace, and the real choice is how efficient the new one should be.
What a new furnace costs in Annandale.
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 Annandale.
The air conditioner is half the furnace’s age
Check the labels on both. If the condenser is under ten and the furnace past twenty, replacing the furnace alone keeps the younger half working. Within a few years of each other? Price the pair too; furnace and AC together come to $8,898 to $23,000 installed.
It shares a chimney with the water heater
A high-efficiency furnace vents out the side in plastic pipe, which can leave the water heater alone in a chimney sized for two. Ask about that before you pick a furnace, not on install day.
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 Annandale.
Fairfax County
Fairfax County requires a permit to replace any gas appliance, even like for like: a gas water heater, furnace or boiler. Replacing a fuel-burning appliance also needs a chimney vent certification. Source.
How to pick the best furnace replacement company in Annandale.
Questions to ask anybody who quotes you, us included.
Will they set the new blower for the air conditioner you’re keeping?
A new furnace’s fan speeds come set from the factory, not for your outdoor unit. Ask whether the installer matches the cooling airflow to the condenser’s size and checks it running.
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.
Excellent price and service. Had our AC/heating system replaced. Gave us a great price and top quality install. Can’t say enough good things about them.
5.0 stars across 884 Google reviews. Read them on our reviews page.
Furnace replacement questions from Annandale.
Does Washington Gas pay anything toward a new furnace in Annandale?
Fairfax County’s utility list puts most of the county on Washington Gas, with Columbia Gas only in parts of Chantilly and Herndon, so an Annandale gas bill is almost always Washington Gas’s. Its Virginia rebate list pays toward a high-efficiency furnace, more at 97 percent efficiency and up than between 95.1 and 96.9, and a contractor in its network files it. Check its current terms before picking a model.
My Annandale furnace died but the AC went in a few summers ago. Do both have to go?
No. A young air conditioner usually stays, and the new furnace gets matched to it. If the coil turns out to be the weak part, you’ll see that in writing before anything is ordered. Not sure the furnace is finished? The diagnostic visit is $99.
How much does a new furnace cost in Annandale?
$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.
Furnace replacement in the towns next door.
- Furnace replacement in Falls Church
- Furnace replacement in Springfield
- Furnace replacement in Dunn Loring
- Furnace replacement in Burke
- Furnace replacement in Fairfax
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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 Annandale 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.