Your air conditioner will run more effectively if it’s maintained at least once a year. Many professionals will recommend twice-annual maintenance calls, since this gives your air conditioner year-round protection. If you need to know when to call for AC maintenance, one visit in the early summer and one at the end of fall is usually considered an efficient schedule. However, it is important to keep environmental factors in mind that could create the need for additional maintenance. For example, some years the Cottonwood seed and debris is more prevalent than in other years, increasing cleaning recommendations.