Add a little of your favorite fabric softener to the pan. This provides fragrence as well as increases the pads ability to absorb water. The more water there is the more air-water contact time. The better the evaporation.
The amount and frequency that you add will depend on your aroma "tastes" and what kind (if any) water replacement proceedures you use.
You can also simply drop in a "Fresh Air Block", available wherever cooler parts are sold. This is an algeacide. Most of the smell in a cooler are simlpy algae.
If you have questions about Evaporative Coolers feel free to email me. Visit my website, www.easycoolercare.com, and use either the Contact or FAQ button. While there, be sure and download the "FREE GIFT just for visiting".
Larry Galpin Author: Easy Cooler Care A Do-It-Yourself Guide To Servicing & Repairing Your Evaporative Cooler www.easycoolercare.com
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