Okay guys I just moved into a new place and the thermostat is way off. It's a mechanical one, so today I went out and bought a honeywell programmable one and tried to install it. The problem is the wiring which I have no clue.

What is included in the honey well is:

Y
G
W
Rc
Rh

On the mechanical one the wiring is different:

Y
G
W
O
R

Okay this is what I have tried:

Y - Y
G - G
W - W
O - Rc
R - Rh

So I wired it that way and it didn't work. So I tried to switch the orange and red, so it was O - Rh and R - Rc. Now that gave off heat when it was on cool.
So I was messing around with it and I think that Orange is for cooling and the Red is a sort of turn on / power.

If anyone could tell me how to wire this, it would be greatly appricated. I've been trying for a few days now and its fustrating.

Thx fellas

Sorry for the delay.

The terminals on the new stat are:

Y= cooling relay
G=fan relay
W=heating relay
Rc=cooling power feed
Rh=heating power feed

If there is only one control power , then Rc and Rh get jumped out

R on the old one should be the control power feed, not sure what the O is. Do you have a heat pump?

Not sure how much this helps.