Hello! I hope to get some thoughts on an issue I have noticed with a new LG 10,000 btu window air conditioner installed this week to help deal with the humid summers of St. Louis. I'm familiar with the need to install the A/C so it slopes down towards the outside of the building, so I use wood pieces to raise the height of the window sill so the unit will clear the storm window frame. The drain hole of the unit is clear, and there are no obstructions within many feet of the unit.
The problem I am having is condensation is forming on the outside of the unit, primarily on the bottom on the side where the drain hole is, but also a bit about halfway up the side wall of the unit, again on the same side as the drain hole at the back rear of the unit. The condensation droplets on the bottom can be seen from where the side curtains connect near the front of the A/C unit all the way towards the back corner of the unit outside the building. I'm concerned because some of this condensation is dropping onto the wood I use to raise up the sill on the inside of the window frame, and also that water will end up collecting on the outer sill between the window and the storm window frame, eventually soaking through the sill into the walls if it can't weep out quickly.
I've never seen this much condensation on the outside of my other window A/C units before. When I installed the unit I noticed that the tips of 3 screws were poking through the bottom of the unit case at roughly the center of the bottom of the case, could this be contributing to the problem? Or is this just normal condensation because the outside temps are around 90 with a heat index of over 100 when the high humidity is figured in?
I've already reworked the slope of the unit twice in case that was the problem. Currently the unit is sloped so the back is approx. 1/2" lower than the top of the unit where the window guard is, per the manufacturer's instructions.
I appreciate any advice or suggestions that you have to offer. Thank you!