Annual servicing of a window AC unit is not just a sales tactic, but it may not be essential for every household either. The need depends on how often the unit is used and the environment it operates in. Units exposed to dust, pet hair, or heavy seasonal use tend to benefit more from regular maintenance. At Best AC Surplus, we see many cases where simple cleaning and inspection help prevent efficiency loss and unexpected breakdowns. If you're also exploring ac units for sale, choosing a well-maintained model can save money on future repairs and energy costs.