Shift down to 1-2 and go up the hill slowly? Or go the Chinese route and get an electric assist bike. The bigger obstacle for where I live would be 90F temper

Shift down to 1-2 and go up the hill slowly? Or go the Chinese route and get an electric assist bike. The bigger obstacle for where I live would be 90F temperature and 80% humidity. You get sweaty regardless of hills (or any physical exertion for that matter) - just by being outside an air conditioned room for more than 10 minutes.