Mechanical

Heat pumps operate on a reversible refrigeration cycle, allowing a single unit to provide both heating and cooling. By moving heat rather than generating it, heat pumps extract it from the air, ground, or water to warm buildings in winter and reverse the process to provide cooling in summer. This efficient, versatile approach supports sustainability while maintaining reliable temperature control across diverse building applications.

Energy recovery is often required by code, but hazardous exhaust in laboratory buildings can make traditional approaches off-limits. We work with our clients to explore all compliant options to capture waste heat that fit their building type and budget.

Variable- and constant-volume air systems (VAV/CAC) form the backbone of many commercial and institutional HVAC designs. Our approach emphasizes proper zoning, ventilation effectiveness, controllability, future flexibility, and system stability across part-load conditions. In critical environments, constant volume systems are often implemented to maintain fixed airflow rates, pressurization, and code-mandated air changes independent of thermal load. These systems provide predictable performance where environmental stability and contamination control are necessary.

Critical environments may require humidity control within tight tolerances. Our expertise includes the design and commissioning of a variety of different humidity control systems and technologies.

Specialized airside systems are designed to deliver precise control of airflow, temperature, and humidity for spaces with unique environmental requirements. These systems support critical applications in laboratories, cleanrooms, healthcare facilities, and data centers.

Decentralized heating and cooling solutions use localized systems to deliver temperature control for specific areas or buildings, rather than relying on a single central plant. This approach enhances flexibility and reliability across facilities, ensuring continued operation in areas where maintaining power and critical systems is essential.

In cold climates, air-source heat pumps struggle to perform when the outside air has little heat to offer. Geothermal systems solve this by exchanging heat with the ground, which stays at a consistent temperature year-round. CRA partners with geothermal consultants to design a balanced well field, then helps clients select the heat pump system that best fits their goals, budget, and maintenance needs.

6-Pipe chillers provide simultaneous heating and cooling from a single, integrated unit. By combining two independent hydronic circuits and a heat-recovery loop, these systems can transfer energy between zones with different temperature requirements. This design maximizes efficiency, reduces equipment footprint, and supports flexible operation for buildings with year-round comfort requirements.

Designing large chiller plants requires more than selecting equipment — it demands expertise in sequencing, water flow management and hydraulics, redundancy, maintainability, and constructability. Our team delivers high-capacity cooling infrastructure that minimizes energy consumption, supports growth, reduces downtime risk, and prioritizes stable operation.

By managing outdoor air temperature and humidity before it enters occupied spaces, dedicated outdoor air systems (DOAS) maintain indoor air quality while reducing the load on terminal HVAC equipment. This approach enhances occupant comfort, improves energy efficiency, and supports healthier indoor environments.

Emergency and standby equipment design ensures critical building systems remain operational during power outages or unexpected events. Essential mechanical systems are designed and supported to incorporate generators, transfer switches, and power distribution components. A well-integrated, coordinated design enhances reliability, safety, and resilience in facilities that require continuous operation.

By converting water into steam through controlled combustion or electric heating, steam boilers deliver consistent thermal energy to HVAC equipment, sterilization, and humidification. As it becomes more and more challenging to find experts in steam, Cator Ruma has multiple experts who have designed and operated steam plants to provide you with the trusted partner you need on a complex system.

Specialty exhaust systems are designed to safely remove hazardous fumes, particulates, and contaminants within a building. These systems are tailored to meet the unique requirements of laboratories, commercial kitchens, garages, and industrial spaces. Proper design and coordination ensure occupant safety, maintain air quality, and support code compliance while optimizing energy performance as required.