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Unbeatable VRF mechanical support

Select a Diamond Commercial Contractor® for your next HVAC project and feel confident because you’ll have the most knowledgeable, experienced professional on your team.

Indoor Ductwork of VRF system in multi-unit residential setting

Find a Diamond Commercial Contractor

Enter your zip code to find a commercial contractor that covers your area.

Choose a Diamond Commercial Contractor

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Receive faster technical support

Diamond Commercial Contractors have access to priority technical support so you get the support you need, when you need it

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Access to extended warranty coverage

Diamond Commercial Contractors are eligible to offer a two-year labor warranty on CITY MULTI® systems installed in design/build and retrofit projects.

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Deliver VRF expertise

Attending training courses that provide technical guidance on design, application and service for CITY MULTI® systems.

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Exclusive financing options

Diamond Commercial Contractors can offer commercial leasing and financing options, making it easier for building owners to take advantage of CITY MULTI® systems and Zoned Comfort Solutions.®

2025 Diamond Commercial Contractor™ Code of Conduct preview

Download the Code of Conduct

Diamond Commercial Contractors commit to Mitsubishi Electric's high standards for technical training, customer response, and professional business conduct.