Just a quick question.

Do you know what each wire is hooked to on the old thermostat?

Perhaps this will help
http://customer.honeywell.com/techlit/pdf/60-0000s/60-0830.pdf

All but the blue wire was hooked up. So we have 4 wires to try & put into 3 places. We have the manual for the new one but still don't know what 3 wires to choose. Thanks for trying.

The most common color code would be (red-R 24v power) (yellow-Y compressor a/c) (green-G indoor blower) (white-W heat) (black-C common) hope you can use this !