What happens if an A/C condensate drain line clogs while you are away?
The condensate pan overflows. In a condominium the water goes through the ceiling of the unit below, usually into drywall and lighting before anyone notices; in a house it soaks the air handler closet and adjacent flooring. Clearing the line costs a few dollars of labour. Remediating the damage costs thousands.
A Florida air handler pulls litres of water out of the air every day. That water leaves through a narrow condensate line. Algae and dust build a plug inside the line, the pan backs up, and the overflow goes wherever gravity takes it.
In a high-rise, that is your downstairs neighbour's ceiling — which turns a maintenance issue into a liability claim and a conversation with the association. In a single-family home, it is the air handler closet, the wall behind it, and whatever flooring runs adjacent. Either way the damage is hidden while it happens and obvious only when it is expensive.
Prevention is unglamorous: inspect the line and pan, confirm the float switch works, flush the line, and verify the system is actually cooling and dehumidifying, not just showing a setpoint. It takes minutes on a scheduled visit and is checked on every one of ours.