Quote Originally Posted by Thermostat View Post
I think it would be best for you to get a HVAC tech to check your system. Without being there checking your system it is impossible to know what have.

I think you have a heat pump and the the blue wire at your thermostat that is connected to the orange wire at the air handler is for the reversing valve. The white wire is most likely not needed. The extra brown wire could be used for the common wire.
Thank you.