Remote Control - cheapish
On the cheap... Nest Thermostats ($200-$250 each)can be controlled from most any mobile device. Nest also sells webcams that can be accessed remotely. You can buy DLink $60-$200) ones as well. Neither of these have a monthly charge.
As long as you have power and a reliable internet connection these work well.
If you want to control any more than that, the whole home systems discussed here may be better.
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Island Girl
....... Make Lemonade
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