Business Details
50+ Years
experience
Emergency
services
Trusted Mechanical Contracting Services in the Pacific Northwest
Founded in 1965, we have dedicated six decades to redefining mechanical contracting excellence across the Pacific Northwest. Our team of over 1,500 experts specializes in HVAC, plumbing, electrical systems, and smart building technologies, delivering comprehensive solutions from design to fabrication and ongoing service. With 13 strategic locations and our own prefabrication facility, we combine innovation with precision to tackle projects of all scalesfrom historic renovations to cutting-edge data centers. Our commitment to sustainability drives every decision, evidenced by our Climate Pledge and LEED-certified projects that reduce environmental impact while maximizing efficiency.Recognized as a 2025 Best Workplace, we prioritize collaboration, safety, and continuous improvement, ensuring every client partnership builds lasting value for communities. Through 24/7 emergency support and preventative maintenance programs, we guarantee operational reliability for critical systems. Our legacy of trust is built on listening to clients, executing flawlessly, and maintaining transparency throughout every project lifecycle. From thermal energy centers to healthcare facilities, we transform buildings into smarter, healthier spaces that meet todays demands while preparing for tomorrows challenges.
Services
HVAC Systems
Plumbing Services
Electrical Systems
Fabrication
Smart Building Solutions
Energy Efficiency
Preventative Maintenance
Emergency Repairs
Design-Build Projects
Sustainability Consulting
Details
- Year established: 1965
Highlights and features
- We offer 60+ years of mechanical contracting expertise across the Pacific Northwest.
- Our 1,500+ experts deliver end-to-end solutions from design to maintenance.
- We operate 24/7 emergency service for critical system reliability.
- Our in-house fabrication shop ensures precision and efficiency for complex projects.
- We pioneered sustainable building practices with LEED-certified and energy-efficient solutions.
What people say
Best in the business
Excellent emergency response
Sustainable solutions
Expert team
On-time delivery
Services
HVAC Systems
We design, install, and maintain advanced heating, ventilation, and air conditioning systems for commercial buildings. Our solutions optimize indoor air quality, energy efficiency, and occupant comfort through smart controls and predictive maintenance technologies. With expertise in both new construction and retrofit projects, we ensure systems meet evolving regulatory standards while minimizing operational costs.
Plumbing Services
Our comprehensive plumbing solutions cover design, installation, and maintenance of commercial plumbing infrastructure. We specialize in high-efficiency water systems, medical gas installations, and code-compliant piping networks. Our team utilizes BIM technology for precise system integration and offers 24/7 emergency repair services to minimize downtime for critical operations.
Smart Building Solutions
We implement intelligent building management systems that integrate HVAC, security, lighting, and energy monitoring. Our solutions enable real-time performance tracking, predictive maintenance, and energy optimization through IoT-enabled controls. These systems enhance operational efficiency while improving occupant comfort and reducing environmental impact for modern commercial facilities.
Energy Efficiency
Our energy efficiency experts deliver comprehensive assessments and implementation strategies to reduce building energy consumption. Services include energy modeling, system retrofits, and renewable energy integration. We help clients achieve LEED certification and meet sustainability goals through data-driven solutions that balance environmental responsibility with cost savings.
Fabrication
Our 100,000+ sq ft fabrication facility produces precision-engineered components for mechanical systems. Using BIM technology and automated manufacturing processes, we create custom HVAC ductwork, piping assemblies, and structural elements. This in-house capability ensures quality control, reduces field labor time, and accelerates project timelines for complex commercial construction projects.
Questions
What services does MacDonald-Miller offer?
We provide HVAC, plumbing, electrical systems, smart building technologies, and energy efficiency solutions for commercial and industrial clients.
Do you handle large-scale construction projects?
Yes, we specialize in complex builds including data centers, healthcare facilities, and high-rise developments.
Are your services available 24/7?
Our emergency repair team operates 24 hours a day, 7 days a week for critical system failures.
How does MacDonald-Miller support sustainability?
We implement energy modeling, renewable integration, and LEED-certified practices to reduce environmental impact.
What geographic areas do you serve?
We operate throughout the Pacific Northwest, including Washington, Oregon, and Idaho.
Reviews (1)
Meagan Maloney
Dec 07, 2016
Report
This is by far, the BEST mechanical contractor and maintenance company out there! You will NOT find a better company that has the attention to detail, customer service, follow through, and AMAZING work! If you are looking for the absolute BEST partner in your HVAC needs, you have come to the right place! I can't say enough good things about them!
