Open 24/7 for emergencies
AC repair in Hamilton starts with a $99 diagnostic visit. Half the owner homes heat with electricity, so the unit out back is often a heat pump.
Get your price in writing
Send this and the office calls or texts you back to set a time.
We’ll call or text this number about your request. By sending it you agree to our terms and privacy policy.
Rather talk now? (703) 997-9757
5.0 stars across 1,132 reviews
One of our HVAC technicians beside an outdoor unit at a Northern Virginia home, the vans at the curb.
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
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
or $31/mo at 0% APR for 60 months
Repair diagnostic visit
$99
Monthly figures: 60mo @ 0% APR on each starting price, the whole price financed, on approved credit. Longer plans lower the payment and cost more in total. The lender sets the final terms. How financing works
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’s different in Hamilton
The closest weather station with thirty years of normals is the cooperative one in Purcellville, about two and a half miles west-northwest of town. NOAA’s 1991 to 2020 normals put the average July afternoon at 86 degrees, with about 30 days a year at 90 or hotter, and on July 28, 2023, mesonets across western Loudoun recorded heat indices above 110. A run capacitor weakens with heat and age, and the hottest week of the summer is usually the one it picks to fail; a new one is $240 to $370.
Electricity heats 665 of the 1,298 owner homes in 20158, and electric heat here nearly always means a heat pump. The Purcellville normals set the heating load at 4,942 degree days against about 1,050 for cooling, so the outdoor unit that carries July carries far more hours from November into March. That’s why a failing defrost board, replaced for $450 to $1,150, is worth catching in August.
Summer storms here bring wind. On July 25, 2010, thunderstorm winds put at least thirty trees down across Hamilton, and on July 21, 2019, gusts estimated at 61 knots damaged a home’s roof on Meadowlark Drive, just northeast of town. After one like that, walk out to the outdoor unit before switching the cooling back on: limbs on the fan guard, fins bent by branches, a disconnect box knocked loose. If the power flickered and the house won’t cool, check the breaker and reset the thermostat. Still nothing? Call us after the storm and we’ll check the whole system.
Nine homes in ten across 20158 are detached houses, plenty on country lots where the condenser sits in the open beside a lawn or a field. Mowing season blows clippings and seed fluff into the coil, and a packed coil can’t shed heat. In propane homes the air conditioner shares the furnace’s blower, and a blower wheel caked with dust starves the cooling too; pulled and cleaned, that’s $300 to $440.
By the numbers
From the Census Bureau’s 2020 to 2024 survey. Median year built and heat count owner-occupied homes only.
ZIP 20158 as a whole: every Hamilton address, the Town and the countryside around it. The Census place for the Town alone has too few homes for steady figures.
What you’d notice
A storm that drops the power for a second can leave the system idle at a tripped breaker, and a surge can take out a capacitor, a contactor or a control board. Reset the breaker and the thermostat first; if it still won’t cool, the $99 diagnostic visit finds which part.
Ice on the outdoor lines in July means low refrigerant or starved airflow. Shut it off to thaw and call; running it iced can take out the compressor.
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.
Choosing who fixes it
Questions worth asking anybody who comes out, us included.
In a Hamilton heat pump house the same outdoor unit carries the winter. Ask the tech to switch it to heat for a few minutes before packing up, so an August repair doesn’t leave a December failure waiting.
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.
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.
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.
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.
Elvis did excellent work repairing my heater and air conditioner. I couldn’t be happier!
Where we work
Next door to Hamilton: Paeonian Springs, Waterford, Purcellville, Leesburg and Lovettsville.
Questions
Read the data plate on the side of the outdoor unit: the manufacture date is printed there or coded into the serial number, and the refrigerant is named on it. Of the homes in 20158, 386 went up in the 2000s, and plenty still run their first system. On an R-22 system that’s leaking, put a replacement price next to the repair; a refrigerant leak repair runs $1,850 to $2,700.
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.
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.
Ready when you are
Call, or send the form at the top. 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
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 Hamilton 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.