A: T1035 is the basic model:
Model T1035: Battery or system powered, 5+2 day programmable, 1-Heat/1-Cool for use with gas/electrics, heat pumps, electric & hydronic heat. Extremely simple to operate and features a large, easy to read digital display.
Compatible with 2, 3 or 4 wire systems its sleek styling and white color blend beautifully into any decor. RC and RH terminals.
T7900 has all the same features and more, but it can't be operated on batteries like the T1035 can. It will have to use the RC/RH 24 volt + and the "C" common 24 volt - terminals to work.
The T1035 doesnt have an optional wi-fi control.
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Answer provided by: Kris (1/3/2017)