Smart Thermostat Guide

What is a smart thermostat?

Switch energy provider

and save today

Get a brand new quote
  • Save £302* on your bills

  • Compare and switch in 5 minutes

  • Ofgem Confidence Code accredited website

Our handy guide outlines everything you need to know about 'smart' thermostats

A smart thermostat allows you to control the heating of your home remotely, from your smartphone or tablet.

It can be programmed so your heating comes on at a certain time or at a certain temperature. Some models can even intelligently work out how long it will take to heat rooms in your home.

Big 6 brands, big price savings – save £302* on your bills

What makes smart thermostats ‘smart’?

Smart thermostats do away with the inconvenience of walking into a freezing cold house because the heating wasn’t programmed to come on. Instead, you can use your phone or tablet to power up your home remotely.

The top models can ‘learn’ about your rooms and how long they take to heat, and then use that information to warm your home more efficiently.

For example, instead of programming the gadget to turn on at a particular time or temperature, you can tell some smart thermostats exactly what time you want your home to be warm.

The thermostat uses what it has learned about how long your house takes to heat, along with information from the internet about the outside temperature, and brings the heating on at precisely the right time. That means no wasted energy on warmer mornings and no freezing starts if there’s suddenly a cold snap.

Some smart thermostats can also ‘learn’ about your habits and preferences, so it can heat your home at the right time without you having to remember.

Heating in this more efficient way means that you’re less likely to waste energy, and should see lower energy bills. And being able to track, record and measure how you use your heating can make you more mindful of how much it's going to cost, as well as highlighting where there's money to be saved.

This, in conjunction with a quick energy comparison to check you’re on the most affordable tariff, can make a significant impact on your utility bills.


Turning down your heating by one degree could save you up to £80 a year

According to the Energy Saving Trust, correct as of March 2018.


There are a few different models on the market, each with their own take on what a smart thermostat should do. Here's a run-down of the current popular models to help you decide which is right for you...

Nest, from Google

Nest is the Google-owned 'learning thermostat' designed for a connected home. It has a sleek, attractive design and an easy-to-navigate app. It even rewards energy-efficient decisions with a little leaf image, helping you to save money. Over time, it becomes harder to ‘earn’ a leaf, encouraging you to save even more energy.

What’s particularly smart about this thermostat is that it learns. If you turn the heating down on your way to work each day and turn it up on your return, the Nest learns the pattern and starts doing it automatically.

Its in-built motion detector allows it to work out when the house is empty and turn the temperature down to a safe but affordable level, meaning you don’t have to re-program it when you go on holiday.

The device’s Wi-Fi capability means that you can send it commands, but it also means the gadget can access weather reports and adjust its heating accordingly. For example, it might usually begin heating a property at 6:30am to have it warm for 7am. However, if it knows there’s a frost then its algorithm might prompt it to come on a little earlier that day to make sure it’s warm when you get up.

Nest’s app allows you to control and program the heating, but it also gives you regular reports on your energy use, so you can see real-time data about how much you’re spending on heating. It also allows you to set a hot water schedule, meaning you can turn the hot water off when you’re not using it, right from your phone.

Nest won’t give exact figures on estimated savings because so much depends on what customers already use and how much they change their behaviour.

How much does a Nest thermostat cost?

Nest costs £239 with installation or £179 without, although the company recommends installation by a professional.

How do smart thermostats work?

Hive, from British Gas

Hive is British Gas’ smart thermostat offering. At first glance it looks like a normal heating programmer. It has a typical LCD screen and buttons but behind the standard front is a clever gizmo that’s connected to the web and works with an app.

Again, the Hive lets you control your heating and hot water from a distance, communicating using a hub that you plug into your broadband router. It allows you to set schedules for your heating and hot water, but also to receive feedback on how much you use and energy saving tips.

British Gas says customers could save up to £130 a year by using Hive and adapting their energy consumption as a result.

How much does a Hive thermostat cost?

You can either make a one-off payment of £249 for Hive, or you can spread the cost over a year with 12 £19.99 monthly payments. Both options include professional installation.


As with Nest, tado° is a more autonomous smart thermostat that adjusts temperatures automatically, depending on the weather. When it senses the house or flat is empty, it lowers the temperature, and raises the temperature when you return.

It does this by pairing with an app on your smartphone that tracks your location. It also intelligently predicts the ideal temperature and monitors the weather online, meaning it can factor the temperature outdoors into its calculations. You can also manually adjust and set the heating.

According to tado°, you could save up to 31% on your heating costs. However, there’s an online calculator that lets you make a more accurate saving prediction based on your specific household.

How much does a tado° thermostat cost?

You can rent tado° for £3.99 a month for a minimum of 12 months, but at time of writing the complete thermostat starter kit is priced at £199.

HeatSmart (from Netatmo), with EDF Energy

The HeatSmart thermostat lets you control and set your heating remotely so you don’t have to heat an empty home. It’s available to everyone, not just EDF Energy customers.

HeatSmart can be controlled using a smartphone, tablet or desktop. It ‘learns’ your heating habits, using what it knows about heating your home and the temperature outside to predict when the heating should come on to be most efficient.

HeatSmart also provides information on the energy you use to help you make energy-saving changes.

How much does a HeatSmart thermostat cost?

It costs £199, including the installation which takes around two hours.

The smartest move

Smart thermostats are a rapidly growing market, with new models introduced every year to make our homes smarter. It’s worth considering other models such as the Drayton Wiser Multi-zone Kit 1, climote, Honeywell Lyric T6, Genius Hub or the Heatmiser Neo, to see which is the right one for your home and your needs.

One thing all smart thermometers have in common is that they can make a big difference to the cost of heating your home and, coupled with some changes in your behaviour, can save most households hundreds of pounds a year.

Please note: any rates or deals mentioned in this article were available at the time of writing.

Did you find this helpful? Why not share this article?

Switching with us is really simple



More energy services

Let us help you save on your bills - switch online or by phone today: 0800 177 7019