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A smart thermostat can help you save money on heating in the winter and cooling in the summer—but they don't come cheap. Some can ring up to $300 or more.

You have the option of getting a refurbished smart thermostat like this Certified Refurbished Ecobee3 Lite that's only $169.99. It's a great deal compared to the never-been-used Ecobee3 Lite that's $219.99 or the smart thermostat with voice control that costs $329.99.

The company says you can save up to 23% annually on heating and cooling with this product.

It's simple to install and connects to your phone (iPhone or Android) so you can adjust the temperature from anywhere at any time.

Customers really like the fact that they can turn on the air-conditioning a few minutes before they come home from work, the grocery store or a long hike so it's not wasting energy by being on all day with no one home.

Even though it's refurbished, this thermostat has been inspected and fully tested to confirm it's like-new. You can purchase with peace of mind knowing it comes with a three-year warranty and a 30-day full refund policy.

Certified Refurbished Ecobee3 Lite

Price: $169.99

Details: This smart thermostat is as sleek as they come. It's refurbished but it's been inspected and fully tested to confirm it works just as well as the brand new ones. It syncs to your phone so you can control the heat or air conditioning even when you're not home. If you're an Enbridge Gas customer, you can apply to get $75 off!