AC & heating repair in Gaithersburg, MD: we connect you with top-rated local HVAC pros, checked by our team — their proposals come straight to your Homeshi account. Free for property owners.
In Gaithersburg, July highs average about 87°F and January lows about 25°F.
In Montgomery County, July highs average about 87°F and January lows about 25°F, with roughly 45 inches of rain a year.
Over the last 10 years the National Weather Service recorded damaging thunderstorm winds, floods and flash floods in Montgomery County, with hail up to 2 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
The typical home in Montgomery County was built around 1978, about 48 years ago, and 52% were built before 1980. Homes that age often need updated wiring, plumbing and roofs.
Montgomery County has had 14 federal disaster declarations in the last 25 years, most often for hurricanes; the latest was Severe Winter Storm (2026).
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Book the AC tune-up in spring and the heating check in fall, before the first real heat or cold — repair slots fill fast in a heat wave.
Central AC units usually last 12–15 years and furnaces 15–20; past that, a repair often costs more than it saves.
If the system is over 12–15 years old or needs a major part (compressor, heat exchanger), ask for both prices — the pro sends them on Homeshi so you can compare.
Washington Grove · Rockville · Laytonsville · Brookeville · Garrett Park · Kensington · Chevy Chase View · Barnesville