In article ,
Jim Redelfs wrote:

In article ,
Ed Wicks wrote:

When compressor is on, air coming out of unit is 64 degrees. When
compressor is not running, air coming out of unit is 82 degrees.

I agree with the OP: The unit is not getting sufficient ventilation. You
should install a air-exchange ventilator in the space occupied by the outside
portion of the unit.

I was not familiar with an air-exchange ventilator. I see that it does
something like take stale/hot air out and replace it with fresh air.
Since my a/c in effect sits in one end of a tunnel, completely blocking
that end, and the other end of the tunnel opens into the garage, I do
not see how the fresh-air-replacement part would function.
If I installed an exhaust fan in the end of the tunnel that opens into
the garage, do you think that might draw out enough hot air to enable
this a/c to function properly?
Thanks.
Ed.