When it comes to the temperature that one sets on their air conditioning system or their heating unit, it all comes down to a matter of personal preference.
There really is no wrong temperature to set on the air conditioner any more than there is a wrong temperature to set on the heating system. I’m often surprised by people that seem to think that they know everything there is to know about heating and air conditioning units and what temperature should be set on them. The sooner people leave this topic alone and just let others be comfortable in their own home, the better the world will be in my humble opinion. People’s bodies feel comfortable in a wide variety of temperatures, and there’s often little rhyme or reason as to why they are comfortable in one environment over the other. Why would someone impose their views on someone else concerning something that is clearly a personal preference? If someone likes their home nice and cool with a very low temperature when the air conditioner is running, and someone else considers them to be living in an ice box, it’s really not their business anyway. Similarly, if someone likes a very high temperature in their home and uses barely any air conditioning, that is also their personal preference and they are more than welcome to it, because we are free human beings! I’m pretty sure that if you even ask certified HVAC technicians what the appropriate temperature is to put on your thermostat in any given season or in any given weather, they will probably give you a strange look. Unless it is for the sake of saving money on energy bills, setting a temperature on the thermostat is your own personal decision.