If you purchase an independently reviewed product or service through a link on our website, Rolling Stone may receive an affiliate commission. If you’ve been thinking about picking up the energy-saving Nest Learning Thermostat, now’s a great time to add it to cart. With the arrival of the 4th generation Google Nest Thermostat (released in August), Walmart has dropped the price of Google’s 3rd generation smart home thermostat down to just $139.

This is a massive $101 discount, and brings the Nest Learning Thermostat down to the lowest price ever (for comparison, it’s on sale for $173 at Amazon). $139.99 $249.

99 44% off $173.89 $249.00 30% off The Google Nest Thermostat lets you easily set, schedule or adjust the temperature in your home, either through the easy-to-use touchscreen dial, or from a handy app on your phone.

Choose from cooling or heating functions, or set it to eco mode when you’re out, so you’re not wasting energy on an empty home. Thanks to the accompanying app, it’s never been easier to monitor your temperature levels and energy usage; you can also use the app (and your phone) to turn on the heat or A/C as you’re heading home, so you arrive to a comfortable temperature. Nest is the first smart thermostat to get ENERGY STAR-certified for efficiency and environmental impact and it’s super easy to use right out of the box.

Google says Nest Thermostat owners have saved more than 50 billion kilowatt hours of energy since the device was first introd.