Bests & Worsts Reviews from Amazon

I purchased 4 sensi wireless thermostats a couple of months ago. We live in the Northeast and will be away for the winter. I wanted to be able to monitor the house temperature. The 4 thermostats were installed by a professional (the person who installed the gas fired hot water system 4 years ago) and controlled heat only. A/C is on separate thermostats. The appeared to work, but over time the battery indicator showed reduced battery level. I contacted sensi and spoke to a sensi representative. He told me that when they remotely reviewed my connection, all thermostats were on battery power rather than house power. He told me that the thermostats require 20 to 30 volts to operate from house current and if they operate only on battery, the batteries will probably last from 3 to 6 months. When they have no battery power they are as effective as door stops. Obviously, that’s an unacceptable risk for me. I got my voltmeter and checked the wiring. I’m getting 26 or 27 volts at the thermostat. I tried to contact sensi by both e-mail and phone and have received no response. Since I no longer have time to make a change to the sensi thermostats and check them, I replaced the sensi thermostats with the Honeywell and Lux programmable thermostats that I previously used. I am not pleased with sensi service.