CRAC vs CRAH: Which Cooling Approach Should Your Data Center Review First?
Short Answer
CRAC and CRAH differ mainly in where cooling is generated. A CRAC system often brings compressor and refrigerant equipment closer to the cooled space. A CRAH system depends on chilled water or another plant-side cooling source. The right review starts with the facility cooling plant, heat load and maintenance capability.
Where the Choice Changes
- Existing chilled water availability and plant redundancy
- Room sensible heat load and airflow delivery
- Space for self-contained refrigerant equipment versus air handler equipment
- Facility service capability for refrigerant circuits or chilled water systems
VERHI Evidence and Boundary
VERHI publishes Precision Air Conditioner product evidence under Smart Cooling. VERHI does not claim that every CRAC product doubles as a CRAH replacement; confirm chilled water scope, coil performance and control integration through engineering review.
Relevant VERHI evidence: Precision cooling solutions · Precision Air Conditioner products
Comparison at a Glance
| Review area | CRAC | CRAH |
|---|---|---|
| Cooling source | Direct expansion/refrigerant cycle commonly included in the unit | Air handler usually requires chilled water or plant-side cooling |
| Main design questions | Refrigerant capacity, condenser/heat rejection, airflow, humidity control | Chilled water supply/return conditions, coil selection, airflow, control integration |
| VERHI published evidence | Published precision AC product range | Confirm chilled water/CRAH scope and models through engineering review |
Common Follow-Up Questions
Can a CRAH replace a CRAC in the same space?
Not without reviewing the chilled water plant, coil capacity, airflow design and controls. The two approaches have different mechanical and service requirements.
Does VERHI publish CRAH products?
VERHI currently publishes precision air conditioner evidence. Whether a specific project needs a chilled water CRAH solution should be confirmed through engineering review.
Next step: Request a VERHI cooling review with your room layout, chilled water availability and heat load. Contact VERHI with the project requirements.
This comparison is based on VERHI published product evidence and engineering review scope, not on a specific customer installation.
