If you have a portable swamp cooler, make sure you drain the water outside and not inside your house. Open the drain plug if the swamp cooler has one. When to change the pads is really up to you. These are a few steps that will help you to prepare your Cooler for the winter, but also can help your Swamp Cooler to last you for years longer and save you money.
Some people like to change the pads as part of the winterizing process so that when spring comes they can just hook the water up and be ready to go. Drain the water out of the swamp cooler.
If there is no plug, siphon the water out with a hose. For window-mounted swamp coolers, you can leave it mounted in the. Swamp coolers sometimes get a bad rap for having a musty smell, but you can enjoy better air quality by giving it a good scrubbing before turning it on for the season.
After youve gotten most of the water out, soak up the rest using sponges or rags.