These app-enabled smart home devices make it possible to adjust your thermostat from your phone whether you're on the couch, at the grocery store or on vacation -- anywhere your phone is connected to a cellular or a Wi-Fi network.

Many of these devices also work with Alexa, Google Assistant and Siri now too, giving you yet another way to adjust your thermostat settings with remote access. .

Some smart thermostat systems also use smart features like a motion sensor to determine if you're home or away and automatically change the temperature -- both heating and cooling -- for you.

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We'll highlight what makes each model stand out from the rest and ultimately pick an overall winner of the best smart thermostat from the pack.

Nest Learning Thermostat.

Nest Thermostat EResideo Honeywell Home T9.

The Ecobee SmartThermostat is my favorite pick for best smart thermostat available today.

The Honeywell Lyric T5 costs $150, making it our choice for the best smart thermostat pick for those on a budget.

But it's a solid price tag for a Wi-Fi thermostat?

Many models, including the Nest Learning Thermostat and the Ecobee4, cost $249.

This makes the T5 a great "budget" option that works with Amazon Alexa, Google Assistant and Siri (via Apple's HomeKit)?

Read our Honeywell Lyric T5 Wi-Fi Thermostat review.

Resideo Honeywell Home T9 Smart Thermostat.

The Honeywell Home T9 is a $200 smart thermostat from Resideo?

The T9 works with Alexa and Google Assistant and offers reliable performance and a solid app?

Read our Resideo Honeywell Home T9 Smart Thermostat review.

This Wi-Fi programmable thermostat also offers mobile app integration with Google Assistant and Siri, so if you have a Google-Assistant-enabled smart speaker or a HomePod, you can control it with Google Assistant and Siri commands

Nest Learning Thermostat

I hold that the $249 Nest Learning Thermostat is still the best-looking smart thermostat out there

Its rounded design harkens back to old-school thermostats, but the device has a modern look that fits in with nearly any home decor

The $169 Nest Thermostat E looks nice too, but it has more plastic components that aren't as appealing as the Learning Thermostat's stainless steel

Read our Nest Learning Thermostat Third Generation review

And that's important because the mobile app is one of the main ways to interact with your Wi-Fi thermostat when you aren't standing directly in front of it (aside from using a voice command). 

This usually means connecting to the local Wi-Fi network, giving your thermostat a name like "Hallway" or "Bedroom" and then you can start using your thermostat

I also test smart home integration, especially voice-enabled systems you can access through voice assistants like Alexa, Google Assistant or Siri

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