We have two down draft evaporative coolers which we removed from our shop. On one the box is in pretty bad shape, but the motor still works, and the pump. That one is free to pick up.
The other evaporative cooler is in pretty good shape. We wired it to an extension cord, and it comes with a coil of 1/4" cooler line. Yours for $150.
Call, text, or email during business hours: 9 to 5 Monday through Friday. We can load it for you.