Thought more wires trying to hook up nest thermostat

[FredIV5150]

Pulling off my old Honeywell thermostat. This was the wiring setup

 once I removed plate I found more wires

 I know what is in common. I have no idea what the rest are. Are they needed? Obviously they weren't before. Can anyone please shed some light on my situation? I would greatly appreciate it. Thank you very much. I'm not going to spend $300 on a thermostat and then turn around and pay $500 for some guy to come out here and connect it. So if anyone could please **bleep** some light I would greatly appreciate it. Thank you

 

[CT_Homeowner · Accepted solution]

I believe that is standard thermostat wire.  Extra wires there is you need them depending on the complexity of your system.

[FredIV5150]

Ok that's what I was thinking. 

Thanks  All Intel is greatly appreciated.