Hi, I am new on this site. I just want to know what is the minimum size of service entrance conductor and main breaker for 17 lighting outlets and 15 conveniece outlets plus one 1.5Hp aircon and 2000 heater. Your reply would be highly appreciated. Thank you.

The minimum size service to a residence is 100 amps.
The conductor size can be found in NEC T310.15(B)(6); #2AL or #4CU.