OK...I confess. I have gone over to the dark side and installed a Nest Outdoor security camera and have to confess that it's pretty good if a bit flakey on the s/w side.
So I looked at some of their other stuff including the Nest thermostat that Robert mentioned. Am I missing something but I can see little benefit in one over a normal programmable thermostat.
I've yet to look at the Smoke/CO2 alarm.