Answer: There is no filter to change out by your air conditioner, but your condenser coil does need washed or back flushed with a hose. The condenser coil, which is similar to a car radiator, can get blocked with grass clippings or cottonwood from the trees. This is very detrimental to your air conditioner. We recommend a precision tune up and professional cleaning in the spring before you use the system for the hot summer months.