Derbyshire Air Conditioning holds Mitsubishi Heavy Industries Diamond Dealer accreditation — one of the highest levels of recognition in the UK air conditioning industry. This isn't just a badge. It's backed by verified training, proven purchase volume, and real expertise.
Mitsubishi Heavy Industries operates a tiered loyalty and accreditation scheme for air conditioning installers in the UK and Ireland. It's designed to recognise contractors who are not only loyal purchasers of MHI equipment, but who also invest in ongoing engineer training to ensure every system is installed, commissioned and maintained to the highest possible standard.
The scheme has three tiers — Standard Contractor, Diamond Dealer, and Diamond Partner. Diamond Dealer is the second-highest tier, requiring a significant annual volume of MHI equipment purchases and completion of specialist training modules. Only a select number of installers across the entire UK hold this status.
For you as a customer, it means one thing: the team installing your system has been independently verified by one of the world's largest air conditioning manufacturers as meeting their highest standards of competence and commitment.
This isn't just about us — it's about what you get. As a Diamond Dealer, we can offer benefits that most local air conditioning companies simply cannot:
Not all installers are equal. Here's how the MHI scheme works and where we sit.
Anyone can buy a Mitsubishi unit from a wholesaler and bolt it to your wall. But installation quality is everything with air conditioning. A poorly installed system runs inefficiently, breaks down sooner, voids the warranty, and costs you more in the long run.
When you choose a Diamond Dealer, you're choosing an installer that the manufacturer themselves has vetted and approved. Our engineers know these systems inside out — not just how to fit them, but how to get the absolute best performance out of them for your specific property.
Combined with Ash's 33+ years of hands-on experience and our reputation for solving problems that other engineers can't, you're getting a level of expertise that's genuinely rare in this industry.
Every MHI installation we carry out comes with the extended warranty that only a Diamond Dealer can offer. Get a quote today.
It's an accreditation from Mitsubishi Heavy Industries recognising installers who meet their highest standards. It requires significant annual purchase volume of MHI equipment and completion of specialist training modules. Only a select number of UK installers hold this status.
7-year parts warranty on all MHI split and multi-split systems, and up to 10 years on VRF commercial systems. Standard installers can only offer 5 years. This is one of the strongest guarantees in the industry.
No. You get a longer warranty, verified engineer training, and manufacturer-backed quality assurance at the same competitive prices. The accreditation benefits you at no extra cost.
No. Mitsubishi Heavy Industries (MHI) and Mitsubishi Electric are separate companies with separate product ranges and accreditation schemes. We are an MHI Diamond Dealer and install MHI equipment exclusively within the Mitsubishi family.
Our status is reviewed and verified annually by Mitsubishi Heavy Industries based on purchase volume and training compliance. If we don't maintain the standard, we lose the status. It's not a one-off certificate — it's continuously earned.
