Yes, it will make a difference. The AC has a drain pan that catches the
condensate. The water is picked up by the slinger ring condenser fan and is
slung onto the coil giving it a bit more cooling. No drips, better cooling.
Make it level.
Ed, according to the Friedrich manual that came with my in-wall AC,
they are very specific that the unit should be mounted with a
half-bubble lean toward the outside to prevent overfilling of the pan,
and still have slinging action. They specifically say that mounting it
level can result in water leaking back into the house.
You're right about the lean being almost invisible. It's really not
detectable unless you really look closely. It is enough lean, however,
to keep the water from pooling all the way to the house side of the
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