Frost that doesn’t clear
On a cold Sterling morning, a coil covered in frost that hasn’t cleared after thirty minutes or so means the defrost isn’t working. Turn the thermostat off for a bit and call us. Running it iced can hurt the compressor.
Sterling, Virginia
Heat pump repair in Sterling.
For heat pump repair in Sterling, the diagnostic visit is $99. Call SwiftPro, rated 5.0 stars across 1,130 reviews, at (703) 997-9757, 24 hours a day, 7 days a week.
For heat pump repair in Sterling, SwiftPro is rated 5.0 stars across 1,130 reviews and works under Virginia Class A contractor license 2705192276. We cover heat pump repair in Sterling, Countryside, Sugarland Run and Cascades. Colder winters out by Dulles mean defrost and backup heat matter. We price it in writing. A contactor runs $290 to $425 and a defrost board $450 to $1,150, from our published price book.
- Prices in writing, first
- Heat pumps and air handlers
- Dedicated HVAC team
5.0 stars across 1,130 reviews
A Trane heat pump on its pad in a Northern Virginia winter, the kind of morning the calls come in.
Get your price in writing
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Rather talk now? (703) 997-9757
Licensed and insuredVirginia Class A contractor #2705192276
24/7 emergency serviceWe answer day or night, 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
What heat pump repair costs in Sterling.
The same price book as the rest of our site. The diagnostic visit is $99, and the tech prices the repair before starting it.
Repair diagnostic visit
$99
Run capacitor replaced
$240 to $370
Contactor replaced
$290 to $425
Thermostat replaced
$300 to $640
Defrost board replaced
$450 to $1,150
Control board replaced
$550 to $1,180
Prices checked .
We answer day or night, and we will tell you honestly when we can get there.
With Comfort+ membership, $20 a month or $199 a year, the diagnostic visit is included, any service is 15% off, and a heating maintenance visit comes every fall.
What’s different in Sterling
Sterling sits by Dulles, where the cold is longer, so a heat pump here works its defrost cycle harder.
Sterling is next to Dulles Airport, and the airport’s weather is colder than Arlington’s or Tysons’. January lows average about five degrees lower than at Reagan National. For a heat pump, five degrees is a lot. The colder it gets outside, the more often the outdoor unit frosts and runs a defrost cycle, and the longer the backup strips have to carry the house. A pump that is marginal in Arlington can quit in Sterling.
A defrost cycle is normal. The unit pauses, the fan stops, steam rises off the coil for a few minutes, and heat resumes. What is not normal is a coil that stays white for hours, or a cycle that never ends. Either means the defrost board, a sensor, or the reversing valve is in trouble, and on a Sterling cold night it is the first thing that breaks down. If you can watch your unit for ten minutes in the morning, that tells us a lot.
Countryside is the heart of Sterling’s heat pump country, mostly townhouse rows and condos where nearly everyone is electric. Outdoor units are on pads close to the next unit and close to snow shoveled off the walk. Keep the snow back from the coil, and keep the hood and the pad clear. Sugarland Run and Sterling Park have a mix of detached houses and townhouses with the same pumps and the same faults, mostly from the 1980s and 90s builds, so units on their second or third outdoor half.
Gas runs strong in Cascades, Lowes Island and the newer streets to the west, and in those houses a heat pump usually runs alongside a furnace. For an all-electric house, the strips matter. If the aux light has been on much of the day and the house still isn’t comfortable, the strips are doing all the work, and the next cold night will be rough on the bill.
Neighborhood by neighborhood
How the houses across Sterling are heated.
Census figures for each place, and what that usually means for a heat pump. Median year built and heat count owner-occupied homes only.
| Place | Median home built | Most homes are | Heated with | What that means for a heat pump |
|---|---|---|---|---|
| Sterling | 1979 | single-family houses, about 5 in 10 | electricity, about 5 in 10 | Mostly electric heat: heat pumps, and the bill shows trouble first. |
| Lowes Island | 1996 | single-family houses, about 6 in 10 | gas, about 7 in 10 | Mostly gas: heat pumps here often sit over a furnace. |
| Cascades | 1996 | townhouses, about 4 in 10 | gas, about 8 in 10 | Mostly gas: heat pumps here often sit over a furnace. |
| Sugarland Run | 1983 | single-family houses, about 6 in 10 | gas, about 5 in 10 | Mostly electric heat: heat pumps, and the bill shows trouble first. |
| Dulles Town Center | 1998 | condo and apartment buildings, about 5 in 10 | gas, about 9 in 10 | Condo units: small heat pumps, owner’s to fix. |
| Arcola | 2017 | townhouses, about 5 in 10 | gas, about 8 in 10 | Mostly gas: heat pumps here often sit over a furnace. |
| Oak Grove | 2005 | townhouses, about 8 in 10 | gas, about 9 in 10 | Mostly gas: heat pumps here often sit over a furnace. |
By the numbers
Sterling houses, by the numbers
From the Census Bureau’s 2020 to 2024 survey. Median year built and heat count owner-occupied homes only.
Sterling
- Built before 1980about 2 in 10 Census
- Built since 2000about 2 in 10 Census
- Most homes aresingle-family houses, about 4 in 10 Census
- Heated withgas, about 6 in 10 Census
- Rentedabout 3 in 10 Census
- A lot of homes here heat with electricity, most of them heat pumps, so a failing outdoor unit shows up on the power bill before it shows up as a cold house.
What you’d notice
What a heat pump in trouble in Sterling usually does.
Aux or emergency heat that never goes off
When the outdoor unit stops pulling its weight, the electric strips in the air handler carry the house. The house stays warm, and the bill tells you a few weeks later. A stuck contactor is a common reason, and one of the cheapest fixes on our list.
The outdoor unit is a block of ice
A little frost on a cold morning is normal, and the unit melts it off every so often by running backwards for a few minutes. Ice that builds for hours and covers the whole coil usually means the defrost board, a sensor, or low refrigerant.
Need heat pump repair in Sterling?
A person answers day and night. See this month’s deals before you call.
Choosing who fixes it
How to pick a heat pump repair company in Sterling.
Questions worth asking anybody who comes out, us included.
Do they test the defrost cycle, not just the heat?
On a cold-climate call, ask whether the tech will watch a full defrost cycle. A heat pump can make warm air all afternoon and still be failing defrost.
Is the company licensed in Virginia?
Anyone can check on the state’s license lookup. Ours is Virginia Class A contractor license, on every van.
Do they price the repair before they start?
Every heat pump repair on our list has a range, and you hear where yours lands before a part goes in. If someone can’t give you a number until it’s done, keep looking.
Will they tell you when it’s not worth fixing?
An older heat pump with a refrigerant leak is often a bad repair. A good tech says so, with the repair price and the replacement price side by side.
Two of our crew going over a work order before the day's calls.
From our Google reviews
What our customers say.
5.0 stars across 1,130 reviews. Read them on our reviews page.
Swiftpro did a great job fixing my heat pump to get my AC working again. They’re easy to work with and explained everything so that I was able to comprehend the issue well. They beat out other local competitors in price for the same service by 40%.
- 5.0stars across 1,130 reviewsHow we count them
- ABBB Accredited, A ratingCheck it on bbb.org
- 2026Voted a Nextdoor Neighborhood Faves winner two years running: 2026 in 30 Northern Virginia neighborhoods, 2025 in Emerald Chase (Herndon) and Hunters Run (Chantilly)See it on Nextdoor
- #1BusinessRate Best of 2026: the top-ranked heating contractor in Fairfax, VirginiaSee our BusinessRate score
- Class AVirginia contractor, license #2705192276Look it up with DPOR
Where we work
Heat pump repair in every Northern Virginia town we serve
Next door to Sterling: Herndon, Reston, Great Falls, Chantilly and Leesburg.
Fairfax County
Arlington County
Loudoun County
Prince William County
Fauquier County
Stafford County
Every town on one page
The system we put in first
Built to take a beating. Put in by our crew.
Heat lamps, snow and rain on one outdoor unit: that’s Trane’s own film. We’re a Trane Comfort Specialist, on Trane’s own dealer locator, and when you pick a Trane, our crew puts it in.
Films: Trane’s own.
Questions
Heat pump questions from Sterling.
My heat pump keeps steaming. Is it on fire?
No. Steam off the outdoor coil during a defrost cycle is normal, as the unit melts frost. It should last a few minutes and stop. If it never stops or the unit is quiet and white, call.
What does a defrost repair usually involve in Sterling?
Often a defrost board at $450 to $1,150 or a sensor. We test the cycle, find the failed part and price it. If the problem is bigger, we show you the replacement option beside it.
Why does my heat pump in Sterling steam and go quiet in the cold?
That’s defrost. The unit stops the outdoor fan, runs backwards for a few minutes to melt frost off the coil, and you see steam rising. It’s normal. Ice that stays is not.
How much does heat pump repair cost in Sterling?
The diagnostic visit is $99. From our price book, a capacitor is $240 to $370, a contactor $290 to $425, and a defrost board $450 to $1,150. You get the number before we start.
Ready when you are
Tell us what your heat pump is doing.
Call, or send the form at the top. The tech prices the repair from the book before starting, and if the system is at the end of its life you’ll hear that first.
SwiftPro Heating, Cooling & Plumbing
4230 Lafayette Center Dr N, Chantilly, VA 20151
44679 Endicott Dr, Suite 211, Ashburn, VA 20147
SwiftPro Plumber & Water Heaters
4200 Lafayette Center Dr, Suite N, Chantilly, VA 20151
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 1,130 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.