The condition of your evaporative cooler determines the exact time or moment you should get your unit serviced. If it is good, clean, and perfectly working, then follow the yearly service recommendation. Otherwise, if it is not looking that good, and can get shut down at any minute, then you should immediately go for an evaporative cooler service. Running an evaporative cooler in bad condition and without yearly servicing can be very dangerous. Therefore, you should contact an expert technician. Conclusion Now you know everything about how often you should get your evaporative cooler service. If there are still some questions lingering in your head, contact expert technicians at uscomfort.com. Visit here : https://www.uscomfort.com/air-conditioning/evaporative-swamp-coolers/