There are several options for this, but I would imagine Insteon is the one most used by the folks around this forum.
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Garage:
IOLinc garage kit
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Lights:
Insteon switch or module or outlet, depending on application (table lamp? fixture?)
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AC:
Insteon-enabled thermostat
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using my Android smart phone through home WiFi system:
For this you would require a network-enabled controller, such as smartlinc or ISY-99
I also suggest a couple of access points and filters (for any potential trouble-causing electronics).