Netbotz w/ Fluid sensor (Score 1)

The Netbotz unit (a 320 would do) with a fluid sensor on the floor would monitor your house's temperature, humidity, and air speed as well as provide a door contact switch and sense water on the floor. Units with and without cameras are available. A multifloor dwelling would be a bigger challenge, of course. http://www.netbotz.com/

I don't work for them; I just use their products and am reasonably satisfied.