Amazon is offering the 2nd generation Nest Learning Thermostat with a free $40 credit for $249 with free shipping. This is only the second promotion the first promotion of any kind we’ve ever seen on the newest version Nest (updated). The free credit represents a savings of 16% compared to the purchase price. It learns what temperatures you like, turns itself down when you’re away and can be controlled from anywhere over Wi-Fi. Rated 4 out of 5 stars from nearly 1,500 Amazon buyers.

Note that not all home HVACs are Nest-compatible; click here to see if it will work with yours.

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