Business Details
50+ Years
experience
Your Trusted HVAC Partner for Custom Solutions
Founded in 1967 by Alden Okter, Don Miller, and Bill Gebbie, DMG Corporation has grown from a regional HVAC representative to a team of over 100 professionals serving California and Hawaii. Our focus remains delivering personalized engineering support and project management while offering custom-engineered HVAC solutions. With headquarters in Orange, CA, we maintain a 67,000 sq. ft. facility stocked with critical replacement parts and equipment. Our engineers collaborate with building owners, architects, and contractors on equipment design, selection, and commissioning. The 2005 launch of DMG Parts expanded our ability to provide rapid replacement part access, including VFDs and WSHPs.In 2018, we established DMG Service & Controls, a fully licensed division offering maintenance, start-up support, and building controls expertise. Our sales engineers maintain longstanding partnerships with top manufacturers to address diverse HVAC project requirements. Technical support is available through multiple channels, including on-site assistance and remote diagnostics. We specialize in custom air handlers, VRF systems, chillers, and related mechanical equipment. Continuous team expansion ensures clients receive timely, knowledgeable service across our six regional offices.
Services
HVAC Equipment Sales
Parts Supply
Technical Support
Project Management
Controls Design
Maintenance Services
Start-Up Support
Details
- Year established: 1967
Highlights and features
- We offer 56 years of specialized HVAC industry expertise
- Our engineers provide personalized support from design through commissioning
- We maintain immediate access to critical replacement parts 24/7
- Our team includes licensed service technicians for on-site support
- We serve projects across six regional locations in Western states
Services
HVAC Equipment Sales
We represent leading manufacturers of custom HVAC systems including air handlers, chillers, and VRF equipment. Our sales engineers assist with equipment selection and specification for commercial projects. Clients benefit from our technical expertise in matching systems to building requirements while ensuring code compliance and energy efficiency.
Technical Support
Our team provides comprehensive technical assistance for HVAC system design and implementation. Services include application engineering, performance calculations, and specification development. Clients receive support through multiple channels including phone consultations, on-site visits, and remote diagnostics to resolve complex installation challenges.
Parts Supply
DMG Parts maintains immediate availability of critical HVAC components including VFDs, WSHPs, and OEM parts for major brands. Our Orange, CA warehouse stocks compressors, cooling tower components, and filtration systems. Rapid delivery options ensure minimal equipment downtime for commercial operations across our service regions.
Project Management
We coordinate complete HVAC project execution from initial design through final commissioning. Our project managers oversee equipment delivery schedules, installation coordination, and quality control. Clients receive single-point accountability for complex system integrations involving multiple stakeholders and technical specifications.
Maintenance Services
DMG Service & Controls offers preventive maintenance and emergency repair services for commercial HVAC systems. Our licensed technicians perform routine inspections, component replacements, and system optimizations. Clients benefit from extended equipment lifespan and consistent performance through our proactive maintenance programs.
People
Steve Weston
President
Leading DMG Corporation since 2005, Steve Weston oversees strategic growth while maintaining focus on technical excellence. With decades of HVAC industry experience, he ensures the company continues delivering innovative solutions and personalized client service across Western markets.
Bill Gebbie
Founding Partner
As one of DMG's original partners, Bill Gebbie established the company's engineering-first approach in 1967. His legacy of technical rigor and client-centric service continues shaping the organization's culture, influencing three generations of HVAC professionals.
Questions
What HVAC equipment brands do you represent?
We partner with leading manufacturers of air handlers, chillers, VRF systems, and related components. Specific brands available upon request.
Do you provide parts for older HVAC systems?
Yes, our DMG Parts division stocks both modern and legacy components including compressors, cooling tower parts, and filtration systems.
Are your technicians licensed for commercial installations?
Our DMG-SC division employs fully licensed HVAC technicians specializing in system start-ups, maintenance, and building controls.
How quickly can you deliver replacement parts?
Our Orange, CA warehouse maintains immediate availability of critical components with regional delivery options within 24 hours.
Do you support projects outside California?
We serve commercial clients across Western states including Hawaii through our six regional sales offices.
