I have an older remote Hamilton fan that came with the house. I can't find the switch to reverse the fan for summer time. Do I need to take fan down,reverse polarity or is the switch hidden some where?

It's probably a pullchain on the fan itself, and you lost the string that hung down off it.

Reversing the wiring will not reverse the blade. There should be a small slide switch on the side of the housing to reverse the blades. Not sure I ever saw a pull chain do reversing but then that's just me.