Mechanical Systems Expertise for all Commercial Spaces

Behind every great building is a great team. For building owners and managers in the Commercial and Mixed-Use market, we know your challenge is to maintain a high-performing asset that attracts and retains tenants, minimizes costs, and stays ahead of regulations.

With a focus on building lasting relationships, we proactively guide you through regulatory compliance, optimize energy performance, and develop long-term capital plans to enhance your building’s value and significantly reduce operational expenses—all with no surprises.

MacDonald-Miller offers a full spectrum of integrated mechanical services including in-house engineering, design-build capabilities, and prefabrication to ensure constructible designs and expedited project delivery.

We handle all your mechanical requirements under one roof, for a consistent, quality response and faster project completion.

Service & Maintenance

Your building’s efficiency and tenant comfort depend on a mechanical system that runs smoothly. As a full-service HVAC contractor, our factory-certified technicians have you covered from 24/7 emergency services to proactive maintenance, keeping your systems at peak performance.

Special Projects and Tenant Improvements

From complex mechanical overhauls to critical controls modernization, our expertise spans your entire building. Our Service Special Projects team is ready to tackle quick-turn needs to minimize disruption while addressing critical updates or tenant improvements. Our “no surprises” approach means we deliver smarter, faster, and more cost-effective results on every project.

New Construction

As the 12th largest mechanical firm in the country, we are a leading design-build commercial mechanical contractor. From new construction to retrofits, we leverage our in-house engineering, detailing, and estimating capabilities, along with comprehensive prefabrication services, to streamline your project from concept to completion. This integrated approach reduces risk and ensures your projects are delivered with superior quality and on schedule.

MacMiller Capabilities

Commercial and Mixed Use Projects