Letting the sun in is like turning your heaters on. You wouldn't turn on both heaters and aircon in summer, would you ?

Please bring some shade and save energy.

Edit: also, without wind there is a hot and humid bubble around our own body. Fans help a lot with that by bringing fresh dry air right onto the sweat so it can evaporate.

Have an AC if you need to. But please dont have only an AC. Shading and fans pay for themselve in energy savings.