I run a dual system (in Halifax NS) it works for me in my location. Ultimately cheaper than room heat. I cut my power bill in half. Every set up is different and just because something works for one person it may not work for another.
I have an enclosed rack, with hot side and cool side flexwatt. Both hot and cool are controlled by herpstats and there is a back up T-stat on the rack as well, I have back ups on everything.
What I found was that the rack managed with just hot side heaters until the room got below 75-76ºF once it went below this the hot side dropped as well as the cool side. In my case the cool side temps almost always were 2 maybe 3 degrees above the room temps until I got below the 75 then I lost 3 and soon 4 -5ºF below they hot spot too dropped as the flexwatt simply was producing enough heat to cope. My average summer temps are in the 76-82ºF and the cool side heaters rarely kick on. The winter temps are a different story running 65-70ºF and the cool end heaters are often on.
Riches suggestion for each shelf being individually plugged is a great one. Especially in Canada where the laws require any and all electrical installations for commercial use to be inspected and or installed by an electrician. I run my own business out of my home and because of this I am required to have an electrician in to inspect the rack. It makes the racks very expensive, but the penalty for failure is extremely high.
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