Coming back to my suggestion of keeping the 30a in place... the 15kw A/C specs call out Running Watts Desert: 2025 and Locked Rotor Amps: 61. 2025 watts / 115vac = 17.6 amps. Sizing the breaker at 125% (Natl Code) would be 22 amps. Since a 25 amp breaker isn't available the 30 amp would be my choice for the extreme load. Yes, not perfect, but not going to overheat the breaker either. -2cents worth
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