i'm trying to change my a/c thermostat, honeywell - i have connected all wire ecept for the blue and red wire... now there is a slot for rc and rh which i don't know which one to connect too? Please advise " no a/c tonight

Here is a link similar to your question. Apparently, you use the red wire to connect the RC and RH terminal together. The blue wire is not needed.

Honeywell thermostat - DoItYourself.com Community Forums