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Venstar in an attempt to break into the thermostat market came up with this wonder, some with 168 page manual in fine print on how to program the thing, it has not been a success. I cannot speak for you, but I can speak for myself, I would investigate relacing it with a Honeywell or White Rodgers (each just a few pages of bold print instructions required).
Let me know if you are interested in that approach or not, we can go from there.