Furnace and AC replacement in Catlett.
Swapping both the furnace and the AC at a Catlett house runs $8,898 to $23,000 installed. Cedar Run and a long winter decide the details.
- Your price range up front
- Sized to the house, not the old label
- Dedicated HVAC team
Get your new system priced
Cedar Run floods, hail on the fins and 98 freezing nights test a Catlett system.
ZIP 20119 covers every Catlett address, the village included, and the Census counts 1,040 owner homes in it, all detached, with a median build year of 1990. About 180 homes there predate 1940, some in the old railroad village, and about 470 went up in the 1990s and 2000s. A furnace and air conditioner put in with a 1999 house are twenty-seven years old now; even in the quarter built since 2000, the oldest pairs are twenty-six. The builder’s pair has reached the age where a repair bill and a replacement quote start to look alike.
The Census finds no owner home in 20119 on utility gas. Among the 1,040, 526 heat with electricity, and a heat pump system, $8,499 to $21,650, is the swap that fits them. Propane heats 301, the furnace-and-AC pairing, with $4,285 to $14,040 covering a furnace alone while the air conditioner stays. Another 131 list wood or some other fuel. About one in sixteen burns oil; burners aren’t our work, but pricing the move off oil, to a heat pump or a propane furnace, is.
Cedar Run sets the local risk. On the Weather Service’s scale for the Catlett gauge, 15 feet is minor flooding, with water at the low spot on Flatwood Lane; at 21 feet the Route 806 bridge floods and water reaches buildings nearby. The gauge crested at 18.2 feet on July 12, 2013, the day flash flooding closed roads in Catlett, and passed 15 feet again in April 2014 and July 2025. On ground this flat, with floodplain around the village by the County’s account, the floor a furnace or air handler stands on is part of the quote.
Wind finds the outdoor half. On August 13, 2021, gusts estimated at 75 mph brought down numerous trees on Old Dumfries Road, about two miles northwest of the village, and the March 2018 nor’easter kept Fauquier County’s 911 center busy with trees and wires. A propane furnace’s igniter and blower still need power, so a new one rides out an outage no better than the old one. Put the new outdoor unit clear of big limbs, off the low spots in the yard, on a pad that keeps its base above standing water.
Catlett houses, by the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
Catlett
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.
- Median home built1990 Census
- Built before 1980about 4 in 10 Census
- Built since 2000about 2 in 10 Census
- Most homes aresingle-family houses, nearly all Census
- Heated withelectricity, about 5 in 10 Census
- Rentedabout 2 in 10 Census
- A few homes still burn heating oil. We don’t work on oil burners, but a switch to a heat pump or a gas or propane furnace is ours to price.
- Electric heat here usually means a heat pump with backup strips, which is priced as a heat pump system, not a furnace and AC.
What a new furnace and AC costs in Catlett.
$8,898 to $23,000 installed for a furnace and air conditioner replaced together, 2 to 5 ton, from the same price book as our estimator. Where you land depends on the size of the house, the efficiency you pick, and what the ductwork and venting need.
- Furnace and AC together, installed$8,898 to $23,000
- Furnace alone, keeping your AC$4,285 to $14,040
- Heat pump system instead$8,499 to $21,650
The HVAC replacement estimator gives your house its own number. Then we measure, and the price is in writing before anything is ordered.
Two years of labor come with every install. Monthly plans are on our financing page.
When replacing both makes sense in Catlett.
A rust line at the foot of the furnace after the creek came up
A tide mark or rust at the foot of a furnace says water stood against it. Furnace makers’ manuals say not to run one that has been under water, and the gas valve and control board are the parts in question. If that furnace is as old as the outdoor unit, replacing the pair is worth pricing next to repairing the wet one.
Your heat may not be a furnace
Where a lot of homes heat with electricity, the indoor half is often an air handler, and the like-for-like swap is a heat pump system, $8,499 to $21,650 installed.
The outdoor unit runs on R-22
The label on its side names the refrigerant. R-22 hasn’t been made or imported in the US since 2020, so a leak gets expensive. Replace it on your schedule, not in July.
Who signs off on a new system in Catlett.
Fauquier County
Fauquier County counts swapping an electric appliance for a similar one in the same spot as an ordinary repair that needs no permit. Moving an appliance to a new spot takes one. Source.
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.
Outside the town limits, Fauquier County issues the permit. It wants one for any fuel-fired water heater, propane included, and for any heater being moved; an electric one swapped for a similar unit in the same spot counts as an ordinary repair. Trade permits go out over the counter the day the application comes in. Source.
How to pick who replaces your furnace and AC in Catlett.
Ask every company that quotes the job, us included.
Did the quote look at the ducts, or only the equipment?
Roughly 180 of the ZIP’s homes predate 1940, and the historic village counts buildings from 1855 to 1958; the ductwork in those was added after the fact. New equipment can only move the air the ducts will pass. Ask whether the quote measured them, and whether the vent and flue were checked too.
Do they size it to the house, or copy the old label?
The old size is a guess somebody made years ago. Ask whether they measure the house and check the ductwork first. Too big short cycles; too small runs all afternoon in August.
Is the whole job in the written price?
Furnace, outdoor unit, matching coil, refrigerant lines, thermostat, permit and hauling the old one away. If it isn’t on the paper, ask.
Already holding another company’s quote?
Our free second opinion looks at the system you were quoted on and tells you what it actually needs, with our price if you want it.
What our customers say.
Tyler from SwiftPro is very knowledgeable and professional on HVAC. Tech Edis and Rony are very professional and done good job to install AC
5.0 stars across 884 Google reviews. Read them on our reviews page.
Furnace and AC replacement questions from Catlett.
Will a heat pump keep up through a Catlett January?
Mostly, with help. A heat pump loses output as the air gets colder. The Warrenton 3 SE station, seven miles west-northwest, averages a January low just under 25 degrees and about five nights a year at 10 or below, and it read 3 degrees in January 2014 and 2 in February 2015. Fauquier County’s design table uses 17 degrees for winter. On nights near that figure or under it, the electric strips or the propane furnace behind the heat pump carry the house. Ask the quote to name which one backs it up.
Hail dented my outdoor unit. Is that a replacement?
Not by itself. Quarter-size hail fell in Catlett on April 15, 2024, and hail that size presses a coil’s aluminum fins flat. Fins can often be combed back open, which is a repair. What changes the answer is a cracked cabinet, crimped copper lines, or a unit already past twenty years with a furnace that matches it. The diagnostic visit is $99, and it tells you which side of that line you’re on.
How much does a new furnace and AC cost in Catlett?
$8,898 to $23,000 installed for the pair, by size and efficiency. A furnace alone, keeping your AC, is $4,285 to $14,040. The HVAC replacement estimator gives your house its own number.
Do I have to replace both at the same time?
No. If the AC is young and only the furnace failed, replace the furnace. If they’re the same age, do both: a new outdoor unit needs a matched coil, and one built for the old refrigerant isn’t rated for the new one.
Furnace and AC replacement in the towns next door.
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Start with your number, then a written quote.
Call, book online, or take the HVAC replacement estimator first. We measure before we quote, and if a repair makes more sense than a new system, 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 Catlett 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.