golf_bears wrote:
If I understand your problem based on the info you've provided you are running a 15k AC unit on a 20 amp circuit. At high outside temperatures the AC unit keeps running and trips your 20 amp breaker.
A 15k AC unit needs about 22 amps to kick start it. So if it runs almost continuously when outside air is at 90 degrees it makes sense that the breakers are overloaded and too hot.
You need that AC unit running on a 30 amp circuit.
I dont know about your numbers but ACs run on 20 amp circuits. As are my two and every one I have ever had (5-6).