So, I installed a Nest at my mother's last May.  Let me tell you, this thing has been really good at lowering costs.  It has also solved so many of my tech problems with mom.  Now she just texts me and I can adjust her thermostat from my phone when I'm anywhere.   Since I have to do all of her technical support, this makes my life so much easier.   The funny thing is I have it tied into Alexa as well.  That means I can sit in my living room and adjust the temperature in her house just by telling Alexa to do it.

Oh, if you go this route, power companies often have an energy saving rebate for getting a learning thermostat.  I know mom got back $75 in a rebate for that.

I definitely like the Nest product.