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£7500 grant available

Government grants of £7500 are available to homeowners upgrading from an inefficient old boiler.

Carbon & bills reduction

Heat Pumps significantly reduce your CO₂ emissions compared to oil or gas boilers. This means you will also save on your energy bills.

Increase home comfort

Installing a heat pump will enable you to improve the comfort levels of your home by maintaining a comfortable indoor temperature throughout the year.

Diamond Green energy engineer working on a heat pump installation
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Get an instant heat pump quote now

How it works

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You answer

Answer a few quick questions to get an online estimate in seconds, including installation options and product details

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You pick

Our team will arrange a free, no obligation, home assessment at a time that suits you with one of our trained engineers to discuss which installation options will best suit you and your home.

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We install

Our experienced installation team will arrive at a date and time that suits you and will look after your installation from start to finish.

Why choose us?

Quality products

All of our heat pumps are of the highest quality. We choose all products based on performance & reliability, not lowest price.

Honest pricing

We provide fast and accurate quotations with no hidden fees or costs.

Care packages

We offer flexible and scalable packages to suit your needs.

Friendly & professional

Our engineers all carry the correct qualifications for any work they carry out.


Our head office is in Fareham, we cover Portsmouth, Southampton, Bournemouth, Brighton on the south coast. We go north as far as Basingstoke and Farnborough.

We are an independent family owned and run company. Ian and Louise Simm are the company owners, their son and daughter both work for the company.

A key part of the process with us is ensuring a heat pump is right for you and your home. We will assess this early on in the process and advise accordingly.

We are not tied to any manufacturers. We do have products we recommend and we’re happy to explain the reasons why. However it’s your home and we’ll fit the equipment you want.

An air source heat pump (ASHP) is a renewable heating system that extracts heat from the outdoor air and uses it to heat your home. It operates on the principle of refrigeration, transferring heat from a low-temperature source (the outside air) to a higher-temperature space (your home) using a compressor and a refrigerant cycle.

Heat pumps offer several benefits, including reduced heating bills, lower carbon emissions, eligibility for government incentives like the Boiler Upgrade Scheme (BUS), and the ability to provide both heating and cooling. They are also low-maintenance and can be a more eco-friendly alternative to traditional heating systems.

Ready? Use our quote tool to find the perfect solution for you.

Or, if you prefer to talk to a human feel free to call us on 0330 818 8529