Hot, dusty air gives a dirty outdoor coil less room to shed heat.
In Baird’s hot, dusty conditions, the outdoor condenser coil has to move heat from the house into air that is already hot. Dust, grass debris, seed fluff, and windblown material caught in the coil fins create an added barrier just where the system has the least margin. As airflow through the coil falls, the unit runs longer to release the same heat and puts more work on the compressor.
Indoor coils need attention for a different reason. Dirt that gets past a filter, or accumulates while a filter is heavily loaded, settles on the evaporator coil and restricts both airflow and heat absorption. Coil cleaning should include a look at the filter, blower performance, condensate drainage, coil condition, and outdoor fan. Cleaning the visible buildup matters, but an airflow or filtration issue needs attention too or the same restriction returns.