Why is the air conditioner leaking water? The symptom narrows the next observation but does not identify a failed part. For the heating and cooling system, first separate what the thermostat or normal controls request from what the indoor and outdoor equipment actually do. Note airflow, temperature change, timing, sound, odor, visible water or ice and whether the problem affects one room or the whole home, without opening a panel or reaching into equipment.
Describe the water location and affected finishes when calling, then ask whether the scope includes source confirmation, drainage correction, operational testing, and referral for non-HVAC damage if needed. Drain-discharge rules, attic installations, freeze exposure, humidity, mold-response requirements, and responsibility for damaged materials vary by jurisdiction and building. Keep clear of wet electrical equipment and document where water first appears, whether cooling is running, and whether the drain outlet, pan, filter area, ceiling, or nearby plumbing shows a related change. Condensate escaping from HVAC drainage is only one possibility; roof or plumbing water, thawing ice, and moisture on an uninsulated surface can look similar without inspection. A service visit can inspect the coil and pan, drain path and traps, pump or safety switches, airflow and icing evidence, equipment level, insulation, and nearby non-HVAC sources.