Water vapor condenses in the same way moisture from the air condenses on a glass of ice water on a hot, humid day. Lowering the humidity makes you feel more comfortable, but it takes more energy, which reduces the efficiency of the air conditioner. One of the ways manufacturers have boosted air conditioner efficiency is by keeping the condenser coils somewhat warmer, which reduces condensation. Some of the new high-efficiency air conditioners do not dehumidify as effectively. Although there is no industry standard for rating the effectiveness of removing moisture, most literature does list water removal in pints per hour, which will help you compare one model to another.
Some models have the fan speed controlled by a humidistat.
If possible, locate an outside compressor unit on the north side of the house. If that is not possible, try to position the compressor where it will be shaded as much as possible. Window units may not allow you the choice. Mow grass so that cuttings are discharged away from the compressor unit, or brush or spray the cuttings off the compressor unit with a broom or a water hose. Window units, if left in place during the winter, should be wrapped on the inside, and good weatherstripping should be used to block air infiltration around the unit.