The best thermostats are herpstats, for you I would recommend the Herpstat 2 since it will be able to control both of your UTH's separately. The Herpstat 2 will cost you $195
http://spyderrobotics.com/
If money is an issue, then I would suggest that you get 2 hydrofarm thermostats. Hydrofarms are nowhere near as good as herpstats but they will do what you need them to do. (I can explain the difference between the 2 if you want) Hydrofarms will cost you $30 each
http://www.amazon.com/Hydrofarm-MTPR...ef=pd_sim_ol_1
How cold is your room?
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