Climate Comfort with Custom Mechanical Equipment Multi-Zone HVAC

Comfort Built for Commercial Buildings

Custom Mechanical Equipment builds custom-engineered multizone HVAC systems for today’s commercial buildings. The PMZ provides precise zone control, energy-efficient operation, and long-term serviceability in a factory-built solution tailored to your project.

Occupant comfort in a multizone building depends on more than thermostat setpoints. Classrooms, exam rooms, offices, and retail zones often run on different schedules, load profiles, and ventilation requirements - all from a shared rooftop location. CME PMZ3 penthouse units are designed to give each zone its own dedicated heating and cooling path so spaces stay comfortable without the drafty, inconsistent results that come from blending hot and cold air in a central duct.

Each zone operates with its own dedicated system, helping reduce unnecessary energy use while giving building owners a simpler, more maintainable solution. Variable-speed blower motors modulate supply air to match demand, and BACnet-ready controls integrate with modern building automation so facility staff can manage comfort from the same platform they use for the rest of the building.

Independent Zone Control Without Blended Air

Traditional hot deck and cold deck multizone systems maintain separate heated and cooled air streams, then blend them to satisfy each zone. That approach often wastes energy by heating and cooling air at the same time. CME PMZ3 multizone units deliver dedicated zone temperature control without relying on mixed hot and cold air, helping reduce energy consumption while maintaining occupant comfort and compatibility with modern BACnet building controls.

For contractors and building owners, that means fewer comfort callbacks, clearer troubleshooting when a single zone needs attention, and a system your service contractor can maintain with conventional refrigerant circuits without a factory-only truck roll.

Where PMZ3 Delivers the Most Comfort Value

PMZ3 units are built for one- to three-story commercial buildings that require independent zone control. Every PMZ3 is custom-configured to match your building’s layout, structural constraints, and equipment requirements.

Typical applications include:

• K-12 schools and universities - classrooms, admin wings, and tech centers with different schedules and load profiles on the same roof
• Healthcare and clinics - exam rooms, labs, and support spaces that cannot tolerate long HVAC outages during retrofit
• Office and municipal buildings - multi-tenant floors where each zone needs its own setpoint without a full mechanical rip-out
• Retail and mixed-use - storefront zones, stockrooms, and common areas with different heating and cooling demand

Units are custom sized from 5 to 45 tons with 1 to 18 zones. One penthouse covers small offices through large schools - capacity and zone count scale with your building layout, not a catalog SKU that almost fits.

Comfort Features Standard on Every PMZ3

Every PMZ3 ships with equipment that supports consistent, controllable comfort:

• BACnet-ready controls (BACnet IP or MS/TP so your building automation contractor can connect to existing systems)
• Variable-speed blower motors
• Return air smoke detection
• Factory-mounted disconnect
• Service lighting and GFCI outlet

Additional operational options are available when your project requires them: CO2 control by space or return, humidity control by space or return, bipolar ionization and UVC lights, supply air smoke detection, exhaust fans, and condensation neutralization kits.

Equipment configurations include gas/DX, all electric, dual fuel, and hot water/chilled water. Any combination of these configurations is available for your project.

Site Visit, Configuration, and Startup Support

Comfort outcomes start before the unit is built. Custom Mechanical Equipment includes project support with every PMZ3:

• Site visit before fabrication
• Custom unit configuration
• Installation oversight
• Startup assistance
• Owner training

A field technician measures the rooftop and confirms curb, duct, and electrical layout before fabrication begins. CME also oversees installation, performs startup, and provides training on the roof so your team knows how to operate and maintain the system from day one.

Built to Last on the Roof

CME PMZ3 units are built for longevity in real commercial environments - high-quality materials and components, factory assembly and testing in Ponca City, OK, and a penthouse design that keeps service work inside the unit and out of the weather. Maintenance is performed inside the penthouse, out of the elements. Custom Mechanical Equipment has built multizone HVAC for more than 36 years, with project support from first inquiry through startup.

Real-World Comfort and Efficiency

Comfort and efficiency are not separate goals on a well-designed multizone retrofit. At Canyon High School, a Summer 2022 upgrade to CME PMZ multizone systems produced improved zone-level control, eliminated simultaneous heating and cooling, and documented post-retrofit savings of 40.7% measured energy reduction, $146,188 in annual energy cost savings, and 1,274,206 kWh less per year over three years of utility data.

When classrooms and support spaces each receive dedicated conditioning - without blended air streams fighting the setpoint - occupants stay comfortable and operating cost comes down. That is the combination Custom Mechanical Equipment designs into every PMZ3.

For sizing charts, configuration options, and project support details, visit the Multizone HVAC product page.