https://www.techradar.com/deals/best-nest-thermostat-deals

If you've been looking to save money on energy costs, a Nest thermostat is a great option. Nest's line of smart thermostats are designed to save you money by adjusting your heating and cooling as needed. Even better, many electricity providers give rebates when you purchase a smart device like a Nest thermostat. 

In short, a Nest thermostat will pay for itself in no time and continue to save you money on your energy bills for years to come.