How often should I get my air conditioning unit serviced to ensure optimal efficiency and longevity? Is a biannual check sufficient, or should I consider more frequent inspections throughout the operational season? Given the diverse climates and varying usage patterns, what are the benchmarks to determine the ideal servicing frequency for my system? Could neglecting regular maintenance lead to more severe issues down the line, thereby incurring exorbitant repair costs? Moreover, are there signs that I should be attuned to that indicate the necessity for service sooner than expected? For instance, does an unusual rise in energy bills or insufficient cooling suggest that immediate attention is warranted? In what ways do environmental factors, such as excessive dust or humidity levels, impact the recommended servicing schedule? Should the type of air conditioning system I have, whether central or ductless, modify my maintenance expectations? What specific tasks are involved in a typical service visit?