iPhone Screenshots


Come home to Cosy with the help of our super smart heating controller. Cosy is a portable, wireless thermostat that simplifies heating control using an app. Thanks to the Cosy App, you and your family can control your heating and hot water from anywhere - using your smartphone, tablet or PC.

Psst! You’ll need to buy a Cosy system for the app to work. For hot water and twin-zone heating you’ll need to have Cosy set up for this.

Please note: you’ll need to update to the newest version of this app to unlock some of our latest (and greatest!) future features – like temperature graphs – more info below.

Customised heat settings

Take your pick of our four heating, then sit back, relax and let Cosy do the rest. Choose from:
• Slumber - the temperature you'd like your home to be when you're asleep or away from home.
• Comfy - the temperature you'd like it to be when you're at home
• Cosy - the warmest temperature setting for when you need a good ol’ heat boost.
• Hibernate - keeps your heating off but protects your pipes against frost. Hey presto - no burst pipes!

Extra Cosy features: hot water and twin zone

It’s now even easier to tailor Cosy to your home’s heating set-up. Cosy can control your hot water as well as multiple heating zones. All heating events - home and water - can be controlled, scheduled and boosted from the app or the Cosy Display. Easy peasy!

Psst! You’ll need to have your Cosy wired up for twin zone heating and hot water. Get in touch with our support team cosysupport@geotogether.com for more help.

Temperature graphs

You’ll soon be able to see your heating data in even more detail. View your home temperature readings and mode change info for the past 30 days. Coming soon to a Cosy App near you…

Making comfort affordable

Stuck in a meeting (groan)? Invited out at the last minute (hooray)? If so, don't waste good heating time when you're not there. Use the app to turn your heating down to help you save on your energy bills.

Welcome Home to Cosy feature

By connecting a Smart Plug to your Cosy you can schedule your lights, your radio, or even your slow cooker to come on when your heating does. Don't just come home to the warm, come home to Cosy.

Schedules to suit your lifestyle

Simple to set up, you can create up to seven unique heating profiles for Cosy. So if you regularly do something different every day of the week, Cosy will know exactly what to do.

Cosy for all fuels and family members

Now the whole family can download the Cosy App. When someone changes an event it appears in the Activity feed, so you can keep an eye on energy hogs (aka Grandma Jean). Cosy works with gas, oil, LPG and biomass.

Who are we?

Cosy is the result of a lot of brainpower from the team here at geo (Green Energy Options). We're an innovative tech company, based near Cambridge. We’ve been working on energy data since 2006. We’ve already helped many homeowners across the UK turn their houses into Cosy homes. Now, it’s your turn to start coming home to Cosy too!

We’d like to give credit to the following libraries and licences used in the making of our Cosy App:

+ CocoaPods: https://cocoapods.org/legal
+ charts-2.2.5 (Apache License v2.0)
+ fabric: https://fabric.io/privacy

What’s New

Version 3.5.16

Our Cosy app has got even better! Same look, feel and how you use it but the engine that powers our Cosy systems has been improved to work even better than before.

Ratings and Reviews

2.1 out of 5
20 Ratings
20 Ratings
Taluhla ,

Bit clunky

Although simple, there could be just a couple of more tweaks to make it better. You can only have 3 temp settings - I’d like to just be able to set a temperature for a set amount of time sometimes and go with that. The wheels you have to use to set your 3 temperature ranges are awkward and you have to change one before the other, making it annoying to just change one quickly.
Also, quite often when you are close to your max temp and the app states that the heating is on, it isn’t, so radiators are cold but the max temperature has not been reached, so you have to boost to the next range. Bit annoying.

Gimli1981 ,

Cosy good but not the best

The cosy heating system is great but the app lets it down. The smart thermostat is great and being able to control your heating where ever you are is great. But there’s no home kit support and smart plugs are expensive if you want to control very basic lighting with it. Compared to some other systems is extremely basic and doesn’t let you do much. But if you just want to control heating you can’t go wrong with this system. App is clunky and basic but it does work more smart home features and accessories would be better.

neilneil2000 ,

Clear user interface but could do with some refinement

The app is basic and easy to use which is good. It's an app to control your central heating and I hope it stays simple as more features are added.

The new graph feature doesn't appear to work for me though. It shows everything at a constant 30 degrees!

Developer Response ,

Thanks for the review. Glad to hear you're getting on well with your Cosy app. As for the temperature graphs, we have detected an issue affecting a small number of accounts.... our tech team is currently working to get these back up and running so you should be able to see them very soon. Apologies for the inconvenience. ^MH


Green Energy Options Ltd
22.3 MB

Requires iOS 8.0 or later. Compatible with iPhone, iPad and iPod touch.



Age Rating
Rated 4+
© 2016, 2017, 2018 Green Energy Options Ltd


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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