[icehawk]

I've had the same issue with an apartment complex, the AC it could never properly maintain <80F during a summer day.

The issue was that builders didn't properly size the AC unit for the amount of heat it needed to reject in a 5th floor apartment when it was 100F outside.

> or maintain cooling in the summer

Here's the key phrase.

This isn't an issue with a heat pump. They just undersized the unit.