Prime Day 2025 ends tonight, and Lifehacker is sharing the best sales based on product reviews, comparisons, and price-tracking tools before it's over.
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New to Prime Day? We have a primer on everything you need to know. Sales are accurate at the time of publication, but prices and inventory are always subject to change.
In 2015, I accidentally created a major problem for myself: I got my mom a first-gen Amazon Echo, thinking she might like the then-novel smart speaker. She sure did like it, which has meant that for every holiday, birthday, and special occasion over the last decade, I've had to find new smart tech to present her with. She has an Echo in every room, blinds that open and close on their own, smart locks on all the doors—I've been running out of gift options. In December, I stumbled across the Amazon Smart Thermostat and got it as her Christmas present immediately. For months, she's been enjoying it—and now you can, too, because it's 30% off for Prime Day. The sale ends tonight, though.
What it does
In addition to looking positively sleek and chic on the wall, this thing provides a simple way for you to move from a traditional thermostat to a more modern one that can reduce energy usage, saving you money. You will need an Amazon Echo if you want to give it some voice commands, like, "Alexa, increase the temperature," but it works fine without one.
You can set it to automatically switch between temperature preferences. For instance, you can make it cooler in the summer when you're home, but when you're away at work, it can automatically cut the AC until closer to when you'll be back, saving energy use and expense. You can also set the temperature you want at a given moment using the Alexa app on your phone, even if you're not home.
There is another useful way it can save you money, too: Once you buy it, Amazon sends you an email detailing rebates that might be available from energy providers around you. It's Energy Star-certified, which qualifies it for a lot of rebates and just generally helps with energy conservation.
The deal
The smart thermostat usually retails for $79.99 (which is what I paid in December, unfortunately), but you can get it right now for $51.99.
Consider picking up the Amazon smart air quality monitor, too, because they can work together to detect and address hot or cold spots in your home. That one is 36% off, down to $44.99 from $69.99. Honestly, I'm probably going to buy one for my mom and just keep it on hand until the next major holiday. (Don't tell her.)
Looking for something else? Retailers like Walmart, Best Buy, and Home Depot have Prime Day competition sales that are especially useful if you don’t have Amazon Prime.
Walmart’s Prime Day competition sale begins at midnight on July 8 and will include deals up to 50% off. It’s an especially good option if you have Walmart+.
Best Buy’s Prime Day competition sale, “Black Friday in July,” runs through Sunday, July 13 and has some of the best tech sales online. It’s an especially good option if you’re a My Best Buy “Plus” or “Total” member.