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CIRO practice questions - frequently asked questions

Plain answers about how CIRO Exam Prep works: the exam, the questions, pricing, the free trial, and what you actually get.

No - and you should be wary of any site claiming otherwise. Every question here is original, written to mirror the style, difficulty, and judgment the real CIRO exam tests. Each one comes with a plain-language explanation of why the right answer is right and the others aren't.

The CIRO exam spans 8 domains: Safety Standards and Practices; Electricity; Heat Flow; Monitoring System Performance; Valves, Controls and DX Systems; Liquid Overfeed and Flooded Systems; Two-Stage and Secondary Coolant Systems; Evaporator Defrost. Every practice question on this site is tagged to one of these domains.

The CIRO exam has 135 questions and is completed in 3 hours. Our timed practice mirrors that length and pacing, so exam day feels familiar.

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