i have a sensaphone
it works great. I use it to monitor my house when I go on vacation in the winter. They are expensive, but you can save a lot on eBay - got mine for <$100
For the devices that let you control the heater/AC - they work on the thermostat line. If you have electric baseboard heat (like I have) they can't control the 220v to the heaters directly and a relay system would have to be installed.
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