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Diamond Green Energy

Diamond Green Energy

4.7(101 reviews)See reviews·Portsmouth
Air conditioning contractorBoiler supplierGas engineerGasfitterCentral Heating ServiceHeating equipment supplier
Diamond Green Energy — Customer photo
Diamond Green Energy — Customer photo

Reviews

Reviews are taken from publicly available sources.

SM
Saman Muradi4 August 2026

I’d like to thank them first. I bought an air conditioner from them, and I’m very happy with it. It’s economical to run, and Ian was very respectful and helpful. The installation was completed professionally, and the whole experience was excellent. I 100% recommend them ⭐⭐⭐⭐⭐

S9
Shanash 9230 April 2026

We had our service done by Robert Nugent here in Bournemouth. He did an excellent job, was very helpful, and answered a lot of our questions. He also gave us some good advice. Many thanks.

ML
Matthew Lee21 April 2026

What an amazing team. I have had two air con installations from the team at diamond on separate properties. And both time the installs have been absolutely flawless. The team pay great attention to detail and do an amazing job while fitting the systems. With this high level of service, I decided to get solar from diamond as well. The solar install did not quite go as smoothly as one might expect with a few issues popping up before and during the install. I can happily say that the issues were all resolved very swiftly and that the after sale customer support provided by the team was absolutely fantastic.

NB
Nat B14 November 2025

A late review but a good one. We have used the company after a recommendation for boiler service, HIVE installation and pressure problems resulting in fitting a shock arrester. Recently had a boiler moved out of bedroom and into loft area. Great service, polite workers and left all clean and tidy. Will be continuing to use this company.

SS
simon shepherdson5 November 2025

We went with diamond green energy over a couple of other companies because of their attitude towards customer care, their promotional blurb states this as being the reason they started the company in the first place. To provide a service to the customer that was seen to be sadly missing from other suppliers. When they first visited to discuss our solar needs they were the company that answered all of our questions, not just with blurb, but taking the time to explain details other companies just ignored. Was really impressed with this first contact that I felt was not about trying to sell me a product but to discuss the options and he reasons behind these choices allowing us to make an informed decision going forward. They were not the cheapest quote, but we were able to negotiate slightly on this down to a price we felt happy to pay. Once signed up we had to repeatedly chase the scaffolding through diamond as we were never contacted by the scaffolding company as per diamonds instructions on what should happen next. The guys that turned up to do our installation I couldn’t fault. They worked really hard for the 3 days the install took, and took great care making sure that we were happy with every step of the installation. Once they left though and everything was switched on and working their customer support has disappeared. As this was the whole reason we went with diamond, and their own company statement say that this is a core principle of their business. We were told right from the beginning, that if we had any issues setting up the system they would be there to help, even coming out to set it up if needed (we are local to their head office) We are now 20 days on from the system being turned on and we have had no response to our e-mails regarding the certificate needed for the energy company in order to get paid for the excess energy generated. On its own not too much of an issue, but we have also asked for help setting up the system because we cannot figure out how to turn off the battery sending power back to the grid. Meaning we are currently paying to charge the battery from the grid on rainy days (or when it charges from the solar it then sends power from the battery back to the grid) meaning worst case the power we bought to store in the battery gets sent back to the grid… only for us to need to purchase the power a second time when the battery goes flat and we need to power the house. Even if the battery charges from the solar, it discharges to the grid meaning we have to pay for power instead of using our own stored energy. We have asked several times now for advice on this, and when we should expect our certificates but our e-mails go un answered.

GT
Gemma Thresher16 September 2025

Absolutely fantastic company with a superb team of staff that put their customers first. We’ve used Diamond Green Energy for an AC installation and more recently a boiler problem. Both times every engineer has been friendly and professional. Completing the job and leaving no mess whatsoever. Plus they are great guys that are trustworthy and always took time to explain everything to us. The office staff that arrange and organise appointments are also so accommodating and helpful, working around the customer and going the extra mile to make sure everything goes smoothly. I can’t thank you enough for the outstanding customer service and excellent work. We won’t use anyone else and will recommend you to everyone we know.

TG
Ti ga23 July 2025

Some teething issues with communication later in the process but can't fault their customer care. I would recommend them.

Solar panel installers in Portsmouth compared

Ordered by rating, weighted by the number of reviews — businesses with only a handful of reviews do not jump to the top automatically. 5 businesses in this category in Portsmouth are compared.

RankProviderRatingReviewsOpen Sat.
1South Coast Solar Solutions★ 5,064Yes
2Greenstar Solar★ 5,038No
3Solar Voltaics Ltd | Solar & Battery Installers★ 4,949No
4EE Renewables Ltd★ 4,980No
5Diamond Green Energy (this page)★ 4,7101Yes
Contact
+441329234111www.diamondgreen.energyUnit 4, Apex Centre, Speedfields, Portsmouth, Fareham PO14 1TP
Working hours
Monday00:00–24:00
Tuesday00:00–24:00
Wednesday00:00–24:00
Thursday00:00–24:00
Friday00:00–24:00
Saturday00:00–24:00
Sunday00:00–24:00