What Do I Ask When Interviewing an HVAC Tech? (A Complete Guide for Hiring Managers)

Hiring the wrong HVAC technician doesn’t just slow your team down. It costs you in callbacks, damaged equipment, and unhappy customers.

And the problem?

Most hiring managers aren’t asking the right questions during the interviews.

Hiring HVAC techs is harder than it may seem because, unfortunately, managers aren’t sure about what questions to pose in order to predict how a tech will actually perform on the job.

You need more than a shiny, clean-cut resume. You need the right questions and the right direction when interviewing candidates.

So, if you’re stuck asking yourself, “What do I ask when I’m hiring an HVAC tech?”, don’t worry, I’ll take you through questions worth asking in the following paragraphs.

Why asking the right questions matters in HVAC hiring

HVAC, as we know, is a technical trade, but at the same time, it’s also highly customer-facing. Any business in the service industry relies on customer satisfaction, because this impacts your reputation and your callback rates. When your techs leave for jobs, they are a reflection of you and your company as well.

Mistakes can be costly: think equipment damage, safety issues or violations, or sloppy jobs needing a second tech to correct them. If your tech messes up a job, you’re held responsible for the repercussions when the customer isn’t happy. That wastes not only time, fuel, and money from the actual job, but it also puts your reputation on the line.

And then there are peak seasons to account for. When the jobs are coming in, you need reliable techs that can work at a good pace to keep up, but that won’t compromise their work ethic. This is not the time for underperformance or setbacks. In peak seasons, customers want the job done fast and assurance of the quality of the work, and if you aren’t able to provide that, they will go looking for someone who can.

You need to be forward-thinking when it comes to your new hires. A bad hire can become a detriment to your business.

Categories of questions every hiring manager should use

1. Experience and background

These questions aim to assess real-world exposure. But don’t just take their word for it. Double-check the legitimacy of their certifications and previous experience. Keep in mind, being “over-experienced” is a thing.

While many experienced techs are highly adaptable, it’s still worth understanding how comfortable each candidate is with learning new systems and technologies.

Some questions you could ask would centre around the types of systems they’ve worked on, certifications they hold, or training they received, and the equipment they’re familiar with.

2. Technical knowledge

On paper, all techs can appear like the perfect fit for the job. Technical questions can help flush out and separate the real techs from the “desk jockeys”. If a tech is going on a callout, they’d be expected to know the nitty-gritty of the job.

You could ask them to explain how a refrigeration cycle works, how to size an HVAC system, or even what BTU and AHU mean, respectively. The techs who just throw memorized jargon at you are the ones you want to avoid.

You need techs who are able to simplify complex ideas and give clear explanations. This shows they truly understand what they are saying and can interpret the knowledge in their own way.

3. Troubleshooting and problem-solving

Part of the job, a big part, is diagnostics. You need to ensure that your new hire can provide structured thought processes when it comes to troubleshooting. This is not guesswork. There is a systematic, step-by-step process to go through.

You can come up with some hypothetical scenarios to test your candidates and gauge their practical thinking. Ask them to walk you through how they’d diagnose a system failure, or to describe a difficult repair they had to deal with and how they went about solving the issue.

4. Customer service

There’s a popular saying that highlights the importance of customer service: “A happy customer tells a friend; an unhappy customer tells the world.”

Techs are the face of your company, and every one of them should reflect empathy, communication skills, and approachability. Strong customer interaction is a key requirement in HVAC roles.

Ask candidates about how they would handle a frustrated customer, how they’d go about explaining technical issues to customers who ask a lot of questions and want to be talked through the process, and if they have ever been able to turn around a bad customer experience.

Your ideal tech should care about the customer and their satisfaction. Some customers leave you to your devices and let you get your job done, while others like to hover.

These test your patience, but these are the customers that could make or break your reputation and could affect your callbacks.

5. Work ethic and reliability

The job involves a lot of long hours, peak seasons, and emergency callouts. The tech you need is the one who is punctual, who takes pride in their work, and whom you can count on. This trade can get challenging, but your tech needs to show commitment to the trade no matter what comes their way.

Ask about their track record when it comes to their attendance, if they’re comfortable with on-call or emergency work, and how they’d handle the more physically demanding days. You’re looking for the ones who are willing to go the extra mile beyond the set working hours if needed.

6. Safety and compliance

You want a tech who errs on the side of caution and whom you can trust to take safety compliance seriously. It’s better to have an overly cautious tech than a liability to the company.

Try asking candidates what safety procedures they follow on-site, how they’d handle refrigerants safely, and if they have ever stopped a job due to safety concerns. With regulations bearing down on the industry, you need to avoid any negligence whatsoever.

The regulations span energy efficiency in buildings, IAQ, restrictions on certain refrigerants, and even certain certification obligations.

Red flags to watch for during HVAC interviews

With HVAC interviews, it’s when a candidate gives vague answers when asked about their previous experience.

This could indicate that maybe they weren’t so truthful on their resume.

Any candidate would jump at the chance to talk themselves up and proudly speak on previous work they’ve done.

In addition, when asked to describe their troubleshooting process, if a candidate has no structure to their approach, it should be a concern. Troubleshooting would need to follow a sequential approach in order for techs to pinpoint exactly where a failure occurs.

Communication is a key aspect of the job, not just with customers but also with superiors and coworkers. If a candidate showcases poor communication, you might need to move on to the next candidate on the list.

Overconfidence is a killer without detail. Sometimes, candidates can walk into an interview with a chip on their shoulder. And one might mistake this overconfidence for competence. But remember: “the devil is in the details”, and if they are lacking details, maybe they’re just relying on confidence to back up their lack of technical knowledge and experience.

Questions you should never skip

• Questions about their certifications and training
• Their diagnostic process
• Customer interaction-related questions
• Availability and reliability
• Safety knowledge and procedures

How to evaluate answers

It’s important to distinguish between the good answers and the bad ones.

Good answers have depth and detail. Maybe they aren’t the reason the interview wraps early, but you’ll be thankful when someone lays all their cards out on the table and is open and honest with you. Even if a candidate says there is something they haven’t learnt or come across before, look out for whether they mention their willingness to learn. Continuous learning is becoming a valuable trait in the industry.

Good answers have real examples. It’s one thing to memorize a bunch of theory, but to provide practical application and takeaways from real experiences is what demonstrates a well-rounded tech.

The right questions don’t just fill roles; they protect your business

Hiring the right HVAC techs is high stakes for your business. You can’t fully tell how someone will perform on the job, but asking the right questions can reduce the risk. The hiring process needs to be controlled, because it is literally your first line of defence for your company.

Remember this:

Better hires = Fewer callbacks + Stronger reputation

If it all becomes too much, don’t stress. We’ll take care of all your hiring needs here at Darwin Recruitment.