AC tune-up in Catlett.

Summer near Catlett runs hot in spells. NOAA’s closest normals station, three miles southeast of Warrenton, averages July afternoons near 85 degrees and about 21 days a year at 90 or above. It read 99 on July 23, 2011, and on June 29, 2012, the day of the derecho, the Weather Service logged heat indices of 110 to 114 across southern Fauquier before the storms arrived. A capacitor or fan motor near the end of its life usually picks an afternoon like that to quit.

Half of the 1,040 owner homes in ZIP 20119 heat with electricity, which usually means a heat pump cooling all summer and heating all winter. With no piped gas in the Census count, the other common setup is a propane furnace paired with a plain air conditioner. Many of the ZIP’s 471 homes from the 1990s and 2000s started with a builder’s heat pump that’s likely been replaced once by now, often beside an air handler that never was. A new outdoor unit on a tired indoor coil is a mismatch the findings point out.

Storms reach the outdoor unit before anything else in the house. Quarter-size hail fell in Catlett on April 15, 2024, and hail that size presses a coil’s thin aluminum fins flat, closing the gaps the fan pulls air through. On August 13, 2021, gusts near 75 mph brought trees down along Old Dumfries Road northwest of the village, and a falling branch can dent a cabinet or crimp the copper lines where they run up the wall. After a storm like that, call us and we’ll check the coil, the lines and the electrical side.

Then there’s the water. The County’s plan sets Catlett on a nearly flat basin with extensive floodplain along Cedar Run, and the gauge near the village counts 15 feet as flood stage, when water reaches the low spot on Flatwood Lane. It crested at 18.2 feet on July 12, 2013, the day flash flooding closed roads in Catlett, and passed flood stage again in April 2014 and July 2025. If water reached your outdoor unit’s base or its electrical box, leave it off at the breaker until it’s been checked.