A popular option is Home Automation's Omni line (homeauto.com). Figure about $1 to $2 per square foot for labor and hardware to have it installed by a pro, or buy from Smarthome and put it in yourself. Starter kits range from $620 for the Omni LT to $1,700 for the Omni Pro II. Both include a controller and keypad, a thermostat and an outdoor temperature sensor, but the extra grand buys you a more powerful controller, capable of managing up to 176 zones within your home; the LT maxes out at 16. Note that all sensors and light modules are sold separately, as is the online control software, so total cost will vary by home size.