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Depends what you're upgrading from I guess.
I had a standard programmable thermostat (this http://www.screwfix.com/p/horstmann-centaurstat-7-room-thermostat/12157 ) which allowed me to schedule the heating.
I have the same schedule with my Wi-fi thermostat but if I know I'm going to be home late/not at all I can turn off that day's schedule remotely so the heating doesn't come on.
aggi
I think it's because without a Nest most people come home to a cold house and then put the heating on. Or they get up and it's cool but since they're leaving the house in 30 minutes anyway they don't bother putting the heating on.
With a Nest you can put it on earlier, or schedule it to come on so that it's warm when you do get out of bed. So you end up having the heating on more = more expensive.
Sure you can turn the heating off when you've gone out and forgot to do that, but unless you're a forgetful fuckwit this doesn't happen often enough to offset the extra heating you end up using.