• Green Heat Coop logo

    Green Heat Coop is a non-profit, co-operative company focused on the transition away from fossil-fuels to high efficiency, low carbon, high comfort home heating systems. We offer a local and personalised approach to support householders through this change. We can help you understand and navigate the options for your home, including heat pumps and energy efficiency measures.


    We are based in Royston and serve Herts, Cambs, and surrounding areas. We are keen to have the involvement of residents, heating engineers, and building professionals.


    Website: www.greenheatcoop.co.uk

    Email: hello@greenheatcoop.co.uk

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    Telephone: 01223 609 661


    We hope this heat pump test drive will help you think about your next steps into low carbon heat!

  • Here are the stages of your heat pump test drive

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    Use our Augmented Reality (AR) tool on your smartphone or tablet to see what a range of air source heat pump equipment would look like in your own home.

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    Play the sound of a heat pump, with directions on how to set the right volume and listen to it in situ.

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    Guidance on how to set your condensing combi boiler to run in a similar way to a heat pump so you can feel what the heating is like.

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    So you've taken a heat pump for a test drive; here are your next steps. 

  • But first: why you should consider a heat pump

    Heat pumps don't generate heat like when you burn gas. Instead, they capture heat from the air (in the case of an air source pump), and move it into your house. For every 1 unit of electricity you put in, you capture and concentrate about 3 or more units of heat from the outside. This means that heat pumps don’t just let us use clean renewable electricity rather than burning fossil gas. They also reduce the total amount of energy we need to put into heating our homes. Nice!

  • A heat pump system has a number of parts

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    The pump. This sits outside and captures the heat, then pumps it indoors.

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    Most heat pump systems (and all that provide hot water for showers etc.) need a tank to store hot water.

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    Larger radiators may need to be fitted, along with some larger pipes, depending on what you have already. 

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    A special control system, that works a bit differently to those used with other types of heating.


    1. SEE

    Use our Augmented Reality (AR) tool to see what heat pump equipment would look like in your own space

    Using your smartphone or tablet, scan a QR code or visit the one of the links below. Now go to the real world location you would like to view the pump or tank (see positioning guidance further down). Click the "AR" icon and your phone or tablet will go into camera mode. Point it at the ground where you want the pump or tank to appear. It can take a minute to load so be patient. When it appears, you can:

    • reposition it by holding and dragging with one finger
    • or rotate/resize it using two fingers (it should look about 1m wide - if it doesn't, try moving the pump slightly with one finger and the size should correct itself).

    Try viewing it from different angles. You can also take photos and videos to share on social media.

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    Small air source heat pump (~5-12 kW)

    Scan or click this option if you have a small to medium (e.g. 1-3 bedroom) or better insulated home. See the positioning instructions above. (This doesn't show a particular model of heat pump, but is similar in size and form to some available on the market to give you a good idea of appearance.)

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    Large air source heat pump (~12-20 kW)

    Scan or click this option if you have a larger (e.g. 4+ bedroom) and/or less well insulated home. See the positioning instructions above. (This doesn't show a particular model of heat pump, but is similar in size and form to some available on the market to give you a good idea of appearance.)

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    Wall mounted small air source heat pump (~5-12 kw)

    Scan or click this option if you have a small to medium (e.g. 1-3 bedroom) or better insulated home, and are thinking about getting your heat pump installed at height. See the general positioning instructions above. (This doesn't show a particular model of heat pump, but is similar in size and form to some available on the market to give you a good idea of appearance.) Note that this visualisation shows a pump mounted with the lower edge 2m above the ground.

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    Hot water tank (200 litre)

    Scan or click this option to see smaller to average sized tank. Typically it is positioned out of the way in a cupboard. It is also better for it to be near to your heat pump, so as little heat as possible is lost from the pipe connecting the two. For the AR view, you might find it easier just to put it in the middle of a room and get a good look at it!

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    Clearance guide

    Scan or click this option to see to a heat pump sitting on a guide to the clearance distances that are needed around it. Pumps shouldn't be positioned too close to surfaces like walls and fences because this can disrupt the air flow, reducing efficiency. Use this handy guide to check if your intended space is suitable. Note that these distances of for guidance only, and you should speak to your installer and check manufacturer guidelines.

  • Your air source heat pump should...

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    Be outside your house, ideally next to it to reduce pipework.

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    Have good air flow around it. It varies by model, but the back and sides should normally be at least 30cm (1 foot) away from obstructions, and 1.5m (5 feet) free of obstruction in front.

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    Be somewhere that is easy to access for maintenance.

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    Avoid spaces where the sound might cause disturbance, such as directly outside a bedroom or by a boundary to a neighbour.

  • 2. HEAR

    Modern heat pumps are very quiet. But it can be helpful in positioning to get an idea of the sound they make. 

    Simply click play on the audio track below to listen to the type of sound a modern heat pump makes. How will you know you have the right volume? Read on for a guide - or to give you a rough idea, set it to be about the same as a quiet fridge.


    TOP TIP: If you have a Bluetooth speaker or second phone or tablet, put it where you plan to install your pump and play the sound on that. Walk around and listen to it from different positions.

  • To set the right volume...

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    Open an online decibel monitor or download an app (such as Sound Meter for Android or Decibel X for iOS).

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    Find somewhere quiet. Start playing the sound above on your speaker or second device, and measure the sound level 1 metre (3 feet) away from it.

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    Adjust the volume of the sound until you have an average reading of about 50 dB. (This is similar to a quiet fridge, and quieter than many gas boilers.)

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    Now position the speaker or second device where you plan to place your heat pump, and take a listen!

  • 3. FEEL

    Instead of making your radiators scalding hot like a gas boiler, heat pumps make them warm for longer. Luckily, most modern boilers can be run in a way that simulates this so you can feel what it is like. Find out how here.

    1. This part of the test drive will involve turning down the "flow temperature" on your boiler. This is the temperature the boiler sends water to the radiators.
    2. The innovation agency Nesta have created an easy guide to how to do this. Follow the guide here >>> 
    3. In brief, first you will make sure you have a condensing gas combi boiler. The guide will help you to do this.
    4. Don’t make this adjustment if you have a hot water tank, because it has to be heated above a certain temperature to prevent bacterial growth.
    5. You will turn down the flow temperature using a knob or digital control on the front of the boiler.
    6. If you use a thermostat with a timer to control your heating, you will probably need to set it to come on earlier than usual as it will take longer to heat up. But it should still get as warm! If it doesn’t, try turning the flow temperature back up a bit.

    Did you like what you saw, heard, and felt in the test drive? Here's what you can expect from the rest of the process of getting a heat pump.



    Green Heat Coop is building a community approach to heat pump deployment in and around North Herts. We can provide bespoke advice tailored to your home and how you use it. Visit Green Heat Coop online, or email hello@greenheatcoop.co.uk to find out more.



    If you decide to get a heat pump, installers will need to visit your home to assess what size of heat pump you need, as well as other aspects of the systems like tanks, piping, radiators, and controls.



    This can take several days depending on the amount of work involved. Your installer will demonstrate how it works, and also give you commissioning and Microgeneration Certification Scheme (MCS) installation certificates.



    Heat pumps work quite differently to gas boilers, and you will need to learn how to get the best out of them. Your installer will be able to advise you on this.

  • Contact

    To get in touch with Green Heat Coop, use the form below or the contact details above. Please note that any personal details you submit will automatically be sent to Green Heat Coop, and will be subject to their own terms and conditions and privacy policy (available on their website) in addition to our own.