The first thing that you should do when you have a flood and it has damaged your AC unit is to check with your homeowner’s insurance policy to see if you are covered for flood damage. If not, many policies may cover your unit if it has been damaged by wind or a fallen tree limb. Before physically touching the unit, it is important to turn off the electricity to your unit to prevent any harm to yourself and any further damage to the unit. Just simply switch off the breaker viz the fuse box. While most outdoor units are built to withstand all kinds of rain and humidity, it is not designed to be submerged in water. After flood damage, check all the wires, connectors, and electrical components for corrosion, check the seal on the condenser fan motor to see if the seal is broken or motor is damaged, and check the coils in the unit to see if they need to be cleaned. Though water resistant, your indoor unit is more susceptible to water damage. Just six inches is enough to submerge and damage portions of your unit, especially in some areas like crawl spaces under your home. While checking the indoor section of your AC, be sure to turn off the AC on the thermostat. Many thermostats have a battery backup and could still have a level of electricity flowing through the system. Even if your AC unit is still working after the floors, it could take weeks or months for the full effect of the water damage to make itself known. Don’t hesitate to call a local HVAC professional to check and fix these damaged areas.