Of course changing the air filter is one of the best things you can do to keep your air conditioner working, a regular maintenance routine with Portland Heating and AC will keep your unit from malfunctioning during the hottest days of the summer. Neglecting your unit leads to poor air conditioning performance and increased energy consumption, and regular air conditioner maintenance is far less costly than AC repair or a replacement. Call us today at 503-663-7454 for your next AC tune up.great