Quote Originally Posted by thebigspendur View Post
When temps soar and outside humidity goes up A/Cs just have to work harder. If it can't keep things cool and dry it means the unit either isn't matched for the circumstances or it's needs service or replacement.

Commercial units take in outside air so you have a further complication with air balance and negative air flow issues.

I grew up in NYC and summer temps were 90F+ with 70% humidity and in some buildings like movie theaters you would need a coat on in the summer it was so cold.
Did I ever say anywhere that the AC can't keep things cool and dry inside? I said that on hot and humid days the AC will not drop the temp as far as it would on hot and relatively dry days. It is still a lot cooler and dryer than outside and the AC is running almost continuously. To me that means that the AC is less efficient.

Bob