Not all thermostats are easy to install. Most smart thermostats require 5 conductor wire to be run to the furnace. Not all homes have this. This is why you need a professional to get this done right.
Nothing better represents smart-home devices, than the Nest Family of Smart Products. The next generation in home smart technology includes, cameras, heating and cooling, smoke & CO2 detectors & smart home hub. Nest not only lets you control it all via a smartphone app, but also learns your patterns, and will adjust the temperature accordingly. In doing so, Nest claims its device will save you money, as it won't heat or cool your home when you're not there.