Internet-Enabled Thermostat
ptorrone writes "Engadget has a little write-up of what is supposed to be the world's first Internet-enabled thermostat from Proliphix, which has an Ethernet port and a built-in web server and can be controlled from virtually any standard browser. So how long until everything in the home has its own IP address and script kiddies decide to get their kicks messing with your air conditioning during a heat wave?"
Sigs cause cancer.
Home automation is actually pretty simple and the idea's been around for years. Instead of a thermostat being set at a particular level all of the time, it can be dynamically reset by software logic based on whatever rules you can think of. In the mainstream now, there are simple hardware based models that can change their settings based on time of day paterns, but just think of the potential power if a thermostat could base its rules on more relavant details like the outdoor conditions and whether there are people home or not.
Instead of opening windows, you can let outside air in your system with a duct that leads outside, and two dampers with motors, one that shuts off the recirculated air, and one that opens up to the outside. This is done all the time in commercial systems. It's called an economizer.
What we do is calculate outside humidity, space temp and outside temp, and using an enthalpy chart, decide when to open the economizer. The temp can be lower outside, but if it's too humid, the unit needs to work more to remove the water from the air.