If you are not under warranty, you can try to fix it yourself or take the RV in to have the air conditioner fixed. There are a few things you can look for when your Air Conditioner
isn't cooling properly.Your AC just might not be strong enough. On a hot day your air conditioner could be outmatched. You could consider getting a second AC installed or upgrading your current AC. The rate at which your air conditioner can cool is measured in BTUs--the more BTUs the stronger the AC.If you believe your RV air conditioner is plenty big but is not cooling to its potential, there are a few things you can do to improve efficiency by maintenancing your AC.