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A furnace tune-up in Sterling is $99 a system. Dulles averages two freezing nights in October and 13 in November; book before then.
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Two of our heating technicians in a Northern Virginia basement, beside an open gas furnace.
Licensed and insuredVirginia Class A contractor #2705192276
24/7 emergency serviceOften same-day, and we will tell you honestly when we can get there.
Our own HVAC installersA dedicated heating and cooling team, separate from our plumbers
Price in writing firstYou see every option priced before anything is ordered
What it costs
$99 for one furnace, anywhere we work. The tech checks the gas pressure, the temperature rise, the safeties and the sequence of operation, which is the order the furnace lights, heats and shuts down in. A repair it turns up gets a written price first, and you decide.
Furnace tune-up, one system
$99
Heat pump, boiler or ductless mini split tune-up, one system
$99
Comfort+ membership, a heating maintenance visit every fall included
$199 a year
It’s priced per system, so a house with a second furnace for the upstairs is two tune-ups. A heat pump, a boiler or a ductless mini split is the same $99 a system.
With Comfort+ membership, $199 a year or $20 a month covers four visits every year: a heating maintenance visit in the fall, a cooling maintenance visit in the spring, a dryer vent cleaning, and a water heater flush with a sewer camera inspection. We book each one when it’s due.
What’s different in Sterling
NOAA’s 1991 to 2020 normals for Dulles Airport, next door, average about two nights at or below freezing in October and about 13 in November. Reagan National averages none in October and fewer than four in November. October nights at Dulles normally bottom out near 45 degrees, about seven colder than at National. By early November a Sterling furnace is lighting most nights, so the tune-up belongs in September or early October.
About eight in ten owner homes in Cascades, Arcola and around Dulles Town Center burn gas, close to nine in ten on Oak Grove’s townhouse streets, and seven in ten in Lowes Island. Around Sterling Park it’s closer to even, about 44 in 100, Sugarland Run is about half, and in Countryside, where electric heat dominates, only about one owner in five has gas. The heat pumps there get their fall tune-up for the same $99.
Many gas furnaces in Cascades, Lowes Island and Sugarland Run are high-efficiency replacements that make water as they burn, and out here it matters where that water goes. Dulles averages about five nights a year at 10 degrees or colder, and a condensate line routed through an unheated garage or out an exterior wall can freeze on one of them. The pressure switch then holds the burners off until it thaws. A tune-up follows that line to wherever it empties and flags any stretch that crosses a cold spot.
Propane is rare across Sterling, about one owner home in a hundred, but around Dulles Town Center it’s close to seven in a hundred. A propane furnace gets the same tune-up at the same price, with its gas pressure read against the propane figure on its rating plate rather than the natural gas one. Seven in ten homes there are rented; tenants, ask the owner to book.
Neighborhood by neighborhood
Census figures for the owner-occupied homes in each place, and what that usually means for a tune-up.
| Place | Median home built | Most homes are | Heated with | What the tune-up usually meets |
|---|---|---|---|---|
| Sterling | 1979 | single-family houses, about 5 in 10 | electricity, about 5 in 10 | Mostly heat pumps; furnaces are the smaller share. |
| Lowes Island | 1996 | single-family houses, about 6 in 10 | gas, about 7 in 10 | Townhouse furnaces in closets and attics. |
| Cascades | 1996 | townhouses, about 4 in 10 | gas, about 8 in 10 | 1980s and 90s houses, most on their second gas furnace. |
| Sugarland Run | 1983 | single-family houses, about 6 in 10 | gas, about 5 in 10 | 1980s and 90s houses, most on their second gas furnace. |
| Dulles Town Center | 1998 | condo and apartment buildings, about 5 in 10 | gas, about 9 in 10 | Condo buildings: compact gas furnaces in closets. |
| Arcola | 2017 | townhouses, about 5 in 10 | gas, about 8 in 10 | Townhouse furnaces in closets and attics. |
| Oak Grove | 2005 | townhouses, about 8 in 10 | gas, about 9 in 10 | Townhouse furnaces in closets and attics. |
By the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
When it’s worth doing
On a high-efficiency furnace that pattern often points at the condensate line: water freezing where the pipe crosses a cold garage or an outside wall, backing up until a safety stops the burners, then thawing as the day warms. Better found on a mild October afternoon than on a 10-degree night.
Up there it’s the one nobody looks at until the bedrooms go cold. A tune-up gets somebody up the ladder before that.
That’s the night every furnace in town gets asked to work at once. A tune-up in the fall finds a weak part while you still get to choose when it’s fixed.
Safety and paperwork
Loudoun County Fire and Rescue says to have heating equipment and chimneys cleaned and inspected every year by a qualified professional, and to keep anything that can burn at least three feet from all heating equipment. Source.
In its fall clock-change reminder, Loudoun County’s fire and rescue system tells residents to check their carbon monoxide alarms, and recommends one outside each sleeping area and on each level of the home, tested monthly. Source.
Our Virginia Class A contractor license, 2705192276, is on the side of the van.
Choosing who tunes it up
Questions to ask anybody who quotes you, us included.
On a high-efficiency furnace, the intake and exhaust pipes at the wall and the drain line inside matter on a January night as much as the burners. Ask whether the tech checks where each one ends.
Ask before anyone comes out. Gas pressure and temperature rise are readings on a meter, so a real tune-up has numbers in it, not just a look at the filter.
Some tune-ups end in a list. Ask which items are failing now, which can wait a season, and what each one costs, before you agree to any of it.
Two of our crew going over a work order before the day's calls.
From our Google reviews
5.0 stars across 1,132 reviews. Read them on our reviews page.
Quick response, Elvis was knocking my door in a couple of hours after my call to the office. He did full inspection for both HVAC units, and answered all my questions. Both systems are working well. I always have very pleasant experience with SwiftPro
Where we work
Next door to Sterling: Ashburn, Herndon, Reston, Great Falls and Chantilly.
Questions
Mid October. By November Dulles averages about three freezing nights a week, and a part the visit turns up is better replaced on an afternoon the house can do without heat.
It’s worth one. Arcola’s median home went up in 2017, so its furnaces are young, and the readings mostly confirm it was set up right: gas pressure where the maker wants it, temperature rise inside the range on the label. Written down now, they give the next visit something to compare against.
$99 for one furnace, and the same for a heat pump, a boiler or a ductless mini split. If it turns up a repair, you get the price in writing before any work, and you decide.
No. The furnace tune-up is its own visit at $99. The Heating Check and the Clean Heat deep clean, the one that takes the blower wheel out and cleans it, are separate offers with their own terms on our Clean Heat page.
Ready when you are
Call, or send the form at the top. One furnace is $99, and anything it needs gets a written price before any work.
SwiftPro Heating, Cooling & Plumbing
4230 Lafayette Center Dr N, Chantilly, VA 20151
44679 Endicott Dr, Suite 211, Ashburn, VA 20147
Virginia Class A contractor license #2705192276
SwiftPro Heating, Cooling & Plumbing is a licensed, BBB Accredited (A rating), independently owned heating, cooling and plumbing company in Chantilly, serving Sterling and the rest of Northern Virginia. Virginia contractor license #2705192276. 5.0 stars across 1,132 reviews on Google, Angi, Yelp, the BBB and Facebook. SwiftPro maintains a dedicated HVAC team and a dedicated plumbing team.
From SwiftPro Heating, Cooling & Plumbing in Chantilly. Housing figures are the Census Bureau’s American Community Survey, 2020 to 2024, for each place named; permit, water and sewer facts link to each office’s own page and were checked in September and October 2026.