AC repair in Dunn Loring.
AC repair in Dunn Loring starts with a $99 diagnostic visit, and a run capacitor is $240 to $370, priced from our book before any work.
- Prices in writing, first
- Common parts on the truck
- Dedicated HVAC team
Get your AC repair priced
Warm summer nights, 1990s systems, and a derecho down Prosperity Avenue.
Dunn Loring’s own ZIP, 22027, is the newer end of the place: the typical owner’s house went up in 1991, about half in the 1980s and 90s and one in five since 2000, nine in ten of them detached. Those houses usually had central air from the start, so the trouble here is less often ductwork than equipment that has put in its years.
The nearest long-running weather record is a cooperative station in Vienna, 3.6 miles west. Its July afternoons average 84 degrees, with about 13 days a year at 90 or hotter, well under Dulles at 33. The nights are the hard part: July lows there average about 67, so a system here keeps running after dark, pulling water out of the air along with the heat. If the house feels sticky at 74, have the airflow and the temperature drop at the coil measured before anybody adds refrigerant.
Close to three owner homes in ten heat with electricity, which here usually means a heat pump, an outdoor unit with no off season. When we fix one in summer, the thermostat goes to heat for a few minutes before we pack up, so the reversing valve and the defrost controls get proven too. A failed defrost board is $450 to $1,150.
NOAA’s storm records filed under Dunn Loring include the June 29, 2012 derecho, when gusts estimated near 70 mph dropped three large branches across two lanes of Prosperity Avenue, a tree that fell onto a Metro car in July 2017, and a May 2018 storm that blew out an apartment building’s windows near the Metro station. After one like those, look at the outdoor unit before the cooling goes back on: limbs or leaves against the coil, fins folded flat, torn foam on the copper lines, a loose disconnect box. If anything looks wrong, keep it off and call us to check it all before it runs.
Dunn Loring houses, by the numbers
From the Census Bureau’s 2020 to 2024 survey. Median year built and heat count owner-occupied homes only.
Dunn Loring
ZIP 22027 as a whole: every Dunn Loring address. The Dunn Loring Census place is bigger: about three in four of its homes have Vienna mail.
- Median home built1991 Census
- Built before 1980about 3 in 10 Census
- Built since 2000about 2 in 10 Census
- Most homes aresingle-family houses, about 9 in 10 Census
- Heated withgas, about 7 in 10 Census
- Rentedhardly any Census
- Gas heat means a furnace inside and a separate air conditioner outside, sharing one blower, so a tired blower shows up in both seasons.
What AC repair costs in Dunn Loring.
The same price book as our AC repair page. The diagnostic visit is $99, and the common parts ride on the truck, so most of these get fixed on the first visit.
- Run capacitor replaced$240 to $370
- Contactor replaced$290 to $425
- Condensate drain cleared$175 to $420
- Refrigerant topped up$190 to $740
- Blower wheel pulled and cleaned$300 to $440
- Refrigerant leak found and repaired$1,850 to $2,700
- Repair diagnostic visit$99
Often same-day, 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 the cooling and heating maintenance visits are part of the membership.
What a failing AC in Dunn Loring usually does.
It went quiet after a thunderstorm
Power that drops and comes back a few times is hard on the two cheapest outdoor parts: the run capacitor, $240 to $370, and the contactor, $290 to $425. Set the thermostat to off for five minutes, then back to cool. If the outdoor fan still won’t start, call.
The air coming out is warm
Usually the outdoor unit has stopped running. A hum with no fan turning is almost always the run capacitor; silence while the thermostat calls is usually the contactor.
It runs all day and never cools
That’s an airflow problem far more often than a refrigerant problem: a clogged filter, a matted coil, or a blower wheel packed with dust.
How to pick the best AC repair company in Dunn Loring.
Questions worth asking anybody who comes out, us included.
On a heat pump, will they test heating in July?
They should. A summer repair that only proves cooling leaves the reversing valve untested until the first frost, which Vienna’s records put around October 29 in a typical year. Ask to see both modes run.
Do they publish prices?
A company that prints what a capacitor or a contactor costs has already told you the number. One that won’t say until the tech is in your driveway hasn’t.
Do they measure before they sell refrigerant?
A healthy system drops the air somewhere around 16 to 22 degrees across the indoor coil. Low refrigerant means a leak, and topping it up every summer is the expensive way to find that out.
Will they tell you when it’s the end of the road?
Some repairs aren’t worth doing on a 20-year-old system. The good answer shows you the repair price and the replacement price side by side and lets you pick.
What our customers say.
Alex was very professional and the 2 technicians Oscar, and Derek was fast and efficient. They replace my A/C unit within the next day
5.0 stars across 884 Google reviews. Read them on our reviews page.
AC repair questions from Dunn Loring.
Who issues the permit if my Dunn Loring AC needs replacing?
A repair takes no permit. A replacement is mechanical permit work with Fairfax County, the only building office Dunn Loring has, plus the County’s A2L certification for a system on the newer refrigerants.
The power just came back after a storm. Can I turn the AC right on?
Leave the thermostat off a few minutes first so the system’s pressures settle. Outages here can run long: Tropical Storm Irene left about 81,000 across Fairfax County in August 2011, Merrifield, just across I-66, among the hardest hit.
How much does AC repair cost in Dunn Loring?
The diagnostic visit is $99. The common repairs: a run capacitor $240 to $370, a contactor $290 to $425, a condensate drain cleared $175 to $420, refrigerant topped up $190 to $740. A refrigerant leak repair runs $1,850 to $2,700.
Should I repair it or replace it?
Fix the cheap parts on almost anything. Think twice about a big repair on a system over 15 years old, and about any leak on an R-22 system. The HVAC estimator prices a new system in about a minute, so you can put the two numbers side by side.
AC repair in the towns next door.
- AC repair in Vienna
- AC repair in Falls Church
- AC repair in McLean
- AC repair in Annandale
- AC repair in Oakton
More from SwiftPro in Dunn Loring
Tell us what your AC is doing.
Call, or book online and pick a window. The tech prices the repair from the book before starting, and if it’s the end of the road 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 Dunn Loring 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.