I did a lot of research on this a while back and concluded that, no, there don't appear to be. I was hoping that Nest, despite some of their shortcomings, would

I did a lot of research on this a while back and concluded that, no, there don't appear to be. I was hoping that Nest, despite some of their shortcomings, would try to tackle this market. Seemed like a more obvious market for them to move into, as opposed to smoke alarms.