The “T” refer to Temperate as a rating on a commercial compressor refers to the specific climate. T1 is a moderate climate, T2 is a cold climate, and T3 is a hot climate.
T3 compressors are the best as being the most efficient next-generation technology. It has a Dual Rotary Compressor which provides energy efficiency with lesser vibration, and faster cooling. T3 compressor containing outdoor unit does not need any shelter in extremely hot conditions.
Ambient temperatures with a class range from:
T1 is from -7°C to +43°C
T2 is from -7°C to +35°C
T3 is from -7°C to +52°C.