Depending on the extent of the damage, it can cost anywhere from $50 to $200 to have a professional fix a swamp cooler. However, there are some fairly easy and simple things you can try yourself before calling in a professional. For example, checking the filter and making sure it's clean; adding water if necessary; cleaning the fan and spraying it with a disinfectant; and clearing any debris or obstructions from the unit's vents. If you're not comfortable doing any of these things or if they don't seem to be solving the problem, then it's best to call in a professional. They'll be able to diagnose the issue and will likely have replacement parts on hand.

A swamp cooler is a type of evaporative cooler that uses water to cool air. It can cost anywhere from $50 to $500 to fix a swamp cooler, depending on the extent of the damage and the repairs that need to be made. However, it's often cheaper and easier to just purchase a new swamp cooler than it is to repair an old one.