Top critical review
A 4 out of 5 Thermostat with 1 out of 5 Tech Support. Correction..0 zero for tech support
Reviewed in the United States on November 28, 2016
Bought the VT7850 in 2015. It runs the heat pump well and the pic display is kinda cool. The IOS app is a bit simplictic but works well. I would give it at least a 4.5 but for the advertised Dual Fuel compatable. It navaigates the sensors and control the Dual Fuel functions, but it doesn't report any Aux fuel activity. So if it is too cold for your heat pump, the app and Skyport will tell you there was no energy usage during that time. I have had several emails with Venstar support and they have given me the run around for two years. First there was to be a new firmware, but that never came to be, then I was told that because of compatabily, they were going to send me a test unit with the new firmware. That never showed up ether.
This was the main reason I went with this thermostat. It is false advertising as far as I'm concerned.