A/C Routine Maintenance Tampa FL Area

[William Zambrano]

Anyone recommended or do service on their A/C units for their rentals in the Tampa, FL area every 6 months or so? I've acquired a few properties and my major expense thus far has been A/C units "blowing hot air" and few hundred bucks later its fixed. 

At my own home I do early routine cleaning and maintenance which runs about 100$ a year, so wondering if this can be done every 6 months or every year to clean the drain pan, filter, etc. at what frequency?