Hire reliable HVAC contractor staff with a scored assessment

What to take away

Guidance on running a hiring process. Employment obligations vary by jurisdiction and change, so confirm your practice with the relevant agencies before you use it.

Four stages, one weighted score

Run every candidate through the same four stages, and score each one against criteria written beforehand. The table shows a weighting for a technician role. Change the numbers to fit the role, but write them down before the first interview.

Weight the exercise and the reference calls heavily, and the interview least, because it measures interviewing. The levels of the role, from helper upward, are set out in the hiring and training guide, so the assessment only needs the tasks the person will do alone on day one.

Stage one: the same six questions

Ask behavioral questions in the same order and record the answers on the same form. Past behavior is evidence, and an opinion about how someone works is not. Six questions that work in this trade:

Question two is the most predictive. Technicians who know when to stop, and who tell someone, are the ones you can send out alone. Question five separates candidates who reflect from candidates who narrate.

Take notes as they speak, and score afterward against the criteria you wrote before the interview. For question four, listen for how the person would have handled a customer complaint in your firm.

Asking everyone the same questions is also the simplest way to keep the process even-handed, and the EEOC says the law forbids discrimination in every aspect of employment.

Stage two: a paid practical exercise

Give each candidate an hour or two, paid, on a real piece of equipment in a controlled setting, never on a customer's system. Say in advance what the exercise is and how it will be assessed.

One exercise that works is a split system in your own shop, with a fault you set beforehand, such as a failed run capacitor or a thermostat wired to the wrong terminal. The candidate gets ninety minutes, a gauge manifold, a multimeter, a thermometer and the unit's service history.

The pass criteria are written down: they find the fault, say what the repair involves, and write down what they did not check and why. Give every candidate the same task and the same conditions, and keep safety supervision on it, because a hiring exercise is still work.

Offer the same instruments your technicians carry: a gauge manifold, a digital multimeter, a vacuum gauge and a refrigerant scale, as listed in the equipment and setup guide. Watching someone use unfamiliar instruments tells you about learning, which is more useful than watching them use familiar ones.

Score the exercise on the written criteria, not on speed. A candidate who works steadily, explains the fault clearly and records what was left unchecked is easier to send out alone than one who finishes first and says little. Record the scores the same day, while the details are fresh.

Stage three: verify, do not just inspect

Verify three things, and none of them by inspecting a document alone. Check certifications and registrations with the issuing body. Check the driving record where the role involves a company vehicle, on whatever basis your jurisdiction and your insurer permit. Call references rather than reading them.

Refrigerant certification sits under a federal program run by the Environmental Protection Agency and attaches to the person. Under Section 608, technicians are required to pass an EPA-approved test, and the tests are specific to the type of equipment. Ask which type the candidate holds.

The state layers around that certification are in the licensing and compliance guide.

When you call a reference, ask former employers three specific questions: what work did they do unsupervised, how did they handle a job that went wrong, and would you have them back. The pause before the third answer is often the answer.

Whatever checks you run, run them for every candidate at the same stage, and follow the requirements that apply to them where you operate.

Stage four: score, then discuss

Score before you discuss. Each interviewer completes their form independently, then you compare. Discussion first turns a hiring decision into a popularity contest. A written score also gives you something to point to if a candidate asks why the offer went elsewhere.

Compare the forms stage by stage, not only the totals. A candidate who did well in the interview but missed the fault in the exercise has told you something the total hides. When two interviewers disagree, go back to the written criterion, not to the louder voice.

Then make the offer in writing, with the role, the pay, the hours and the classification. Onboarding follows in the staff training checklist.

Before the first candidate walks in

Common questions

Should I hire for attitude and train for skill?

For helper and apprentice levels, largely yes, provided you have supervision capacity. For a role that must work unsupervised on a customer's system tomorrow, skill and permissions are not optional.

Should the exercise really be paid?

Yes. A paid hour or two on equipment in a controlled setting is fair to the candidate, and it keeps the exercise a defined piece of work rather than a free day on the job.

Is a trial period a good idea?

A structured first ninety days with review points works better than an ambiguous trial. Write down what will be assessed and when, and hold the reviews.

What if the best candidate lacks the certification?

Then you are hiring at a lower rung with a training plan, and the offer should say so, including who supervises them and what work they may not do until the certification is held.