Do you only use fans and avoid aircon to save money?

I don't avoid air con, just grew up without one and hence did not have the habit of using aircon now in my own place. I only installed one air con unit in master room and seldom use it.

When I'm not too hot

Don't avoid aircon. Use it when its really hot.

Try not to on aircon in day time.

To clarify, do you mean Only Fans?