Honeywell's models vary too, with some models requiring a professional contractor to come and install—so you can imagine how expensive they get. Almost any smart thermostat will require more money at the outset
then action them on your behalf. For instance, Alexa could automatically turn off any errant lights after everyone has gone to bed, or it could set the thermostat to make the house the perfect temperature for when you get home if you forgot to set it before you left....