Can You Use The Same Chiller For Hvac And Process Cooling? August 4, 2026 In many industrial and commercial-industrial facilities, the question of whether to combine HVAC and process cooling on a single chiller plant is as much a question about operations and risk as it is about engineering. A shared plant can reduce capital cost and simplify infrastructure — but it creates dependencies that must be managed carefully. Here's how to evaluate whether shared plant infrastructure makes sense for your facility. Where Combined Systems Work Well Shared chilled water plants work most reliably when the two load types have compatible characteristics: Similar temperature requirements: both HVAC and process cooling are often served well by 44-50 degrees F chilled water. Where process cooling requires different temperatures (colder for certain industrial processes, or warmer for high-temperature process applications), serving both from a single plant complicates design. Non-overlapping peak loads: if HVAC peaks in summer afternoons and process loads are relatively constant or off-peak during high-HVAC-load periods, the combined peak may not be much larger than either individual peak. Process loads tolerant of moderate temperature variation: HVAC systems handle significant chilled water temperature variation without consequence; many process applications cannot. If your process requires tight temperature precision, a dedicated process chiller is usually the better choice. Where Separation Makes More Sense Reason to Separate Engineering Implication Process requires tight temperature control HVAC system variability affects chilled water supply temperature; process needs dedicated, precision-controlled supply Process operates year-round; HVAC is seasonal Combined plant must be sized for year-round operation even in winter when HVAC load is zero Process load is critical; HVAC is not Combining on one plant links process reliability to HVAC reliability; a chiller failure affects both Process requires specialized coolant Food-grade glycol, deionized water, or other specialty fluids can't easily share a loop with HVAC chilled water "Shared infrastructure can be smart design or a false economy, depending entirely on the load profiles and reliability requirements. We always recommend the systems analysis before recommending a combined approach."— Justin Thomas, General Manager, G&D Chillers Hybrid Approach: Shared Primary Plant with Dedicated Process Loop A common middle path in large industrial facilities: a central chilled water plant serves HVAC loads directly, but also supplies a secondary side where a plate heat exchanger isolates a dedicated process loop. The process side maintains its own temperature and coolant quality; the primary side handles load variation from both uses. This approach provides: Isolation of process coolant from HVAC system for coolant compatibility and contamination prevention Better process temperature control through a smaller, precisely controlled secondary loop Shared chiller plant capital efficiency while maintaining process reliability through loop separation Frequently Asked Questions How do I evaluate whether my process load requires a dedicated chiller? Start with temperature precision requirement. If your process needs +/- 1-2 degrees F or better, a dedicated chiller is almost always the right answer. If it can tolerate +/- 5 degrees F or more, shared infrastructure may work. The next consideration is reliability: if process cooling failure causes safety hazards or significant financial loss, dedicated systems with independent redundancy are appropriate. What is the cost comparison between shared and dedicated plant? Shared plant typically has lower first cost (one plant instead of two, shared maintenance and redundancy infrastructure). Dedicated process chillers add 20-40% to cooling capital cost. However, the operational benefits of isolation — better process temperature, independent reliability, simpler troubleshooting — often justify the premium for production-critical applications. > Talk with G&D's engineers about shared vs. dedicated plant design for your facility -> Contact us