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Which? uncovers three new Best Buy smart thermostats

Find a new smart thermostat for your home, with our advice on the features to look for and the results of our recent testing

Which? uncovers three new Best Buy smart thermostats

We’ve put seven smart thermostats, including models from leading brands Nest (part of Google) and Hive (from British Gas), through our testing to find the very best for your home.

Smart thermostats let you control your heating (and sometimes hot water too) through your smartphone.

The best smart thermostats will be easy to use and install, come with an intuitive and well-designed app, and have a range of features that increase usability. They also read temperature accurately, helping you to monitor your energy usage and cut down your bills.

Best Buy smart thermostats – go straight to our top performers.

Features of smart thermostats

We’ve tested smart thermostats with a range of different features, so you can choose one that matches the way you like to control your heating.

Learning thermostats

Some smart thermostats are able to learn your routine and automatically turn on and off when you’re likely to be in and out of the house. These are a good option if you don’t want to be setting schedules and are looking for a more hands-off experience.

See our full Netatmo Thermostat review and Nest Learning Thermostat 3rd Generation review to see which we recommend.


Always rushing in the morning? This handy feature could save you a task, as it turns your heating off automatically when you leave the house, and turns it back on again when you come home.

For a GPS-tracking smart thermostat, head to our in-depth Hive Active Heating 2 review or Honeywell Lyric T6 review to see if one of these could be the right model for you.

Weather responsive

You don’t want to be left shivering in a snow storm, or sweating in a heat wave, so having your heating respond to the weather could be helpful with the unpredictability of Britain’s weather.

The Tado Smart Thermostat v3 is weather responsive, but is that the only trick up its sleeve? Read our Tado Smart Thermostat v3 review for our expert verdict.

Changing the way we test

When we last tested smart thermostats in 2015, we focused on how easy they are to install and use, and the important features that make life easier.

Although these are still important, we’ve changed how we weight these tests to better reflect how people use their smart thermostats.

If you want to know more, see our guide on how we test smart thermostats.

How accurate is your smart thermostat?

Following reports that smart thermostats would occasionally display an inaccurate temperature reading, or trigger the boiler above or below the set threshold, we now test them for accuracy.

During our scientific testing, we put smart thermostats in a sealed chamber with a heat source to measure how responsive they are. We then give them a score out of five so that you can compare models against each other.

We’ve found one smart thermostat that can be up to 1.5⁰C out on temperature readings, so if you’re really counting the cost of your energy bills or you just want the most precise smart thermostat possible, read our reviews to make sure you avoid this model.

Smart thermostats tested

All the models that have just gone through the Which? test lab are:

Prices correct at 7 June 2018.

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