I'm a big fan of Matt Haughey's blog, and in one of his latest entries he discusses what life is like when using the Nest for 10 months. In case you're wondering, the Nest is a learning thermostat, created by Apple's former iPod designers. The device picks up your patterns in about a week in order to keep you both comfortable and help you save energy costs.
It's hard to say what the bottom line is on energy savings for me. I don't watch our electric bills super closely and our bill includes charges for water too (which usage fluctuates wildly), making quantifying the post-Nest world a bit tougher, but I do know the system goes into auto-away mode reliably several times a week and it's been great to set the whole system to away mode when we've been on vacation. Having a vacant house heated and air conditioned is a lot like running your lawn sprinklers during a rainstorm, a total waste of money. It's also great to have the iPhone/web connections to control it even though I don't need it very often. I remember bringing up the phone app and taking the house out of away mode at the airport when we landed from a vacation, and arriving to a cool house in the summer an hour later. About the only downsides are how it sometimes acts a bit too eager to please. You might have a dinner party and turn on the air conditioning a few degrees cooler than normal to keep guests comfortable, and the thermostat is supposed to ignore one-off moments like this, but I found it slightly adjusting itself at odd times that reflected short term changes. This also happened when I left the country for a week while the rest of my family stayed behind, introducing a new schedule where I wasn't home all week in my home office that had to be adjusted later when I went back to my old schedule.
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