Experts Warn: Turn Off Air Conditioners During Thunderstorms to Prevent Damage

While seeking refuge from summer heat, turning on your air conditioner during a powerful thunderstorm could lead to expensive damage. Specialists warn that lightning strikes, even those occurring nearby, can cause significant power surges that travel through a home's electrical system.

These surges pose a serious threat to sensitive and costly components within your air conditioning unit. The primary danger is not the rain itself, but the sudden increase in voltage that a lightning strike can induce. This electrical overload can damage parts like the compressor, condenser, electronic board, and fan motor, with compressor replacement alone potentially costing nearly as much as a new unit.

Even surge protection systems may not offer complete defense against the intense electrical activity during severe storms. Furthermore, strong winds can propel debris into the outdoor unit, and heavy rains raise the risk of water damage to electrical parts.

Experts advise that no specific setting on the air conditioner can fully protect it during a storm. The 'ventilation' mode does not eliminate the risk of a power surge. The safest recommendation is to cool your home before the storm arrives and, once thunder and lightning begin, to turn off the air conditioner. If it can be done safely, disconnecting the unit from the power supply or switching it off at the main electrical panel is the best course of action.