Why pre-screen HVAC technicians before the interview
Applicants for this work claim a broad range because most job adverts ask for one. The quickest way to find the real depth is the fundamentals: a technician who can describe the refrigeration cycle in their own words has understood it, and one who lists components has memorised an answer. A short screen does that and asks what they carry to a site they have never visited.
What actually matters when screening HVAC Service Technician candidates
- 01
Hands-on competence
Check hands-on range across split systems, rooftop packaged units, heat pumps and mini-splits: brazing, superheat and subcooling checks, EPA 608 Universal card, recovery and charging by weight.
- 02
Safety discipline
Probe lockout/tagout on 480V rooftop gear, refrigerant handling under Section 608, combustion safety checks on gas furnaces, ladder and roof access rules, and PPE habits.
- 03
Fault finding
Test diagnostic reasoning on no-cool calls: reading manifold gauges, megohm testing compressors, tracing 24V control circuits, board fault codes, and distinguishing TXV from restriction issues.
- 04
Reliability and conduct
Assess service call conduct: on-call rotation, work orders in ServiceTitan or similar, callback rate, customer explanations of repair versus replace, and truck stock discipline.
Pre-screening questions to ask HVAC Service Technician candidates
9 questions grouped by what they test. Ask the same set in every screen and score answers on a consistent scale, or send them as an async video screen and compare answers side by side.
Equipment they service
4 questions01Give specific examples of your experience working with gas equipment.
Listen forSpecific appliances worked on, with combustion testing and gas safety qualifications stated clearly.
Gas work described without the required qualification, or combustion analysis never performed.
02Give specific examples of your experience working with steam equipment.
Listen forSteam plant experience with pressure safety understood, including relief devices and blowdown practice.
Steam experience claimed vaguely, or pressure safety devices treated as routine components.
03Give specific examples of your experience with electrical equipment and diagnostics.
Listen forMeters used competently with wiring diagrams read, and isolation performed before any electrical work.
Electrical faults diagnosed by substitution, or work performed without isolating the supply.
04Give specific examples of your refrigeration experience.
Listen forSystem types serviced with charging, recovery and leak detection performed to the required standard.
Refrigerant handling without certification, or venting described as acceptable in any circumstance.
Fundamentals understood
2 questions05What are the main components of a refrigeration system?
Listen forComponents named with the function of each explained rather than simply listed from memory.
A list with no explanation, or components confused with each other.
06Describe the refrigeration cycle in your own words.
Listen forPressure and temperature changes explained through the cycle, in their own language rather than a recital.
A textbook answer with no understanding, or an inability to explain what happens at each stage.
Approach to a call
2 questions07Going to an unfamiliar site for the first time, what tools do you take and why?
Listen forGauges, meters and commonly failing spares chosen deliberately, with reasoning for each item.
An answer that the van carries everything, or no thought about what the call might require.
08Walk me through your last few service calls.
Listen forSpecific faults with the diagnosis and the fix, described in enough detail to be verifiable.
Vague accounts of recent work, or calls described only by the equipment type.
Customers handled
1 question09Provide an example of a difficult situation with a customer and how you resolved it.
Listen forThe complaint acknowledged calmly with a route to resolution, and the office kept informed throughout.
Customers described as unreasonable, or problems handled on site and never reported back.
How to score responses
Score every candidate on the same four criteria immediately after the screen. At this stage you are shortlisting for panel interviews, not making the final call.
Hands-on competence
35%5Names equipment brands serviced, quotes target superheat ranges, holds EPA 608 Universal, and describes brazing and evacuation to micron levels.
Safety discipline
30%5Describes tagging a disconnect before opening a panel, testing for CO and gas leaks, and refusing unsafe roof access without hesitation.
Fault finding
20%5Walks a full fault tree with pressures, temperature split and amp draw readings, and explains a misdiagnosis they later corrected.
Reliability and conduct
15%5Cites low callback numbers, documents findings clearly in the dispatch system, and handles upset customers without overselling equipment.
Gas, steam, electrical and refrigeration appear on the same call. A one-way video screen finds where the real depth is.
Try it on HirevireScreening FAQ
Process basics
How long should a pre-screening round for this role take?
Ten minutes across eight or nine questions, answered async. Enough to establish equipment depth, test the fundamentals, and hear how they approach an unfamiliar service call.
What must be verified alongside the screen?
Refrigerant handling certification, gas qualifications and a driving licence where the role involves travel between sites. These are legal requirements and cannot be substituted by experience alone.
Evaluating answers
What is the strongest signal when screening this role?
Describing the refrigeration cycle in their own words. Technicians who understand it explain the pressure and temperature changes. Anyone listing four components has learned the answer.
How do I judge their diagnostic approach?
Ask what they take to an unfamiliar site. Real answers cover gauges, meters and the specific spares that commonly fail. Anyone who says the van has everything has not thought about it.
Go deeper on this role
Sanat has been hiring since 2012 and watching the recruitment industry change up close ever since, and turned that screening process into Hirevire's video screening platform. LinkedIn
