Black foam tape, black duct tape and black silicone sealant...if it slides out of the case, it will be easier to get to where the leaks are...if it's in a molded plastic case, good luck! You cannot block off the louvers....airflow on small units like this are critical! You can build a box of sorts to cover the entire thing outside, just leave the bottom or side or something open, so the proper amount of air can flow over the condenser coil. That's the outdoor or hot coil...where it blows the heat away. It absolutely HAS to be able to get rid of the heat! I dunno where Ga. is lately...