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

city multi vrf equipment on building roof

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.

contractor with yellow hard hat installing a PKA indoor unit in the kitchen with onlooking homeowners standing nearby

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.