I just installed a Honeywell Thermostat, and the heat is blowing out cold air. I installed a RTH6450, and just replaced another Honeywell. I am assuming the wiring is correct, Red wire to R. Green to G. White to W and Y to yellow. PLEASE HELP!

Sounds like you might have a prob. With the programing of the tstat,, call 1-800-468-1502 for tech help