[header] How to service an air conditioner [title] Make sure the unit is turned off either at the on/off switch or by shutting off the circuit breaker. [title] Check the small copper pipe connecting the unit to the house. [step] If it feels hot, the unit's coils are most likely dirty and need to be washed. 
[title] Rake any leaves and debris away from the unit before you start to service an air conditioner. [title] Take the cover off the unit, and locate the air conditioner coils (they look like a car radiator).