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The thing is, "smart" home hardware is a lot less expensive and more accessible than SCADA or BACnet. I can go out and buy any number of home thermostats, and some of them are even capable of properly supporting all the functions; unfortunately I ended up with the Nest, because it has the best support for enabling both auxiliary heat and emergency heat; but it doesn't have support for interfacing via LAN, and Google rescinded the APIs. Also, the physical interface is infuriating, but it's better than the awful honeywell touchscreen garbage the previous homeowner had installed.