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Best Budget

Amazon Smart Thermostat

The best sub-$100 smart thermostat by a wide margin, with occupancy sensing and Alexa Hunches built in. A no-brainer for Alexa and Ring households.

$60-$80
Pros
  • Far better technology than other sub-$100 options, including occupancy sensing
  • Alexa 'Hunches' can proactively adjust settings to save energy
  • Deep integration with Alexa and Ring devices
  • Simple installation with C-wire adapter included
Cons
  • Best suited for Amazon/Alexa ecosystems — limited cross-platform support
  • No remote room sensors available
  • Lacks air quality monitoring and advanced scheduling of premium models
Why we recommend it

For under $80, nothing comes close. If you're already in the Amazon ecosystem, this is the obvious buy — Alexa Hunches alone make it smarter than thermostats twice the price.

CNET

The Amazon Smart Thermostat stands out among its peers in the sub-$100 category by having far better technology, including the ability to sense if you're home and Alexa's 'hunches' to see if a setting will work while saving you energy.