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Title: Very difficult to replace the batteries
Review: I was very pleased with the ease of installation and operation. After the first winter, the batteries started to go dead. It was next to impossible to pull them out. I had to use a screwdriver to pry them out. (there are small plastic bars that hold them in)After doing so, the metal contacts became loose, and twice the device lost power while in the 'on' mode. We came home to a house in the mid-80's both times, costing us about 8 times the price of this device in heating bills.The operations engineer did a great job. The design engineer did not.
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