Refrigerators that inform their owners when it's time to buy more eggs and thermostats that learn homeowners' heating and cooling preferences may once have seemed like futuristic ideas straight out of a sci-fi movie. However, such products are no longer a dream but a reality. The term "smart home" refers to a residence that has appliances, HVAC, lighting, entertainment systems, security, and many more devices that communicate with one another. Such devices can be controlled remotely, according to SmartHomeUSA, an automation product retailer. Proponents of smart home technology say features can help people save money on utilities and conserve natural…