I am a professional a/c tech.Was asked to install a sensi thermostat made by Emerson.
There were NO installation instructions with the tstat(wiring diagram and configuration details are different for each make and model). Called Emerson tech support, the person required my name and phone number, could not tell me where to get the technical information needed, wanted to talk me through the install( poor English and had never installed a tstat in the field).
The short version; Emerson wanted a trained monkey to do a professional install instructed by a novice reading a computer app???????The Honeywell works great, cost less, came with instructions.