Top HVAC Engineer Interview Questions 2025

With the increasing demand for HVAC services and awareness of ventilation and air quality, HVAC companies are looking to recruit the best HVAC engineers to meet their growing customer base. Over the next few years the global HVAC market is expected to grow by 6% driven by energy efficiency and air quality among other factors. If you want to get a job in the heating, ventilation and air conditioning industry it’s essential to get familiar with the most common HVAC engineer interview questions. Whether you’re a fresh graduate or an experienced professional, knowing what interviewers are looking for can make all the difference. In this guide we’ll walk you through the top questions, key concepts and smart answering strategies to help you stand out from the crowd.

Finding the right mechanical engineer isn’t easy (more than 60% of HVAC companies report difficulty in finding qualified candidates), asking the right questions is the first step.

Follow this guide to ask the best HVAC engineer interview questions to shortlist your candidates. Common interview questions and answers fall into the following five categories:

• General Questions
• Behavioral Questions
• Technical Knowledge Questions
• Technology Questions
• Payroll questions

What is the job description of an HVAC engineer?

HVAC engineers design and coordinate the installation of commercial heating, ventilation, air conditioning and refrigeration systems.

HVAC engineers, sometimes called mechanical engineers, are skilled in developing codes, standards and complex calculations for HVAC systems. Depending on the position, an HVAC engineer may supervise a team of HVAC technicians, perform preventative maintenance, or repair HVAC systems.

HVAC engineers also often have superior communication and problem-solving skills as they coordinate projects and communicate with customers. Most online HVAC engineer job postings require previous work experience. Other HVAC engineer resume requirements include a bachelor’s degree in mechanical engineering, professional engineering (PE) license, experience with AutoCAD and Revit software, or other specialized experience.

Related job titles in the HVAC engineering field may include HVAC design engineer, HVAC mechanical engineer, prefabrication design and construction engineer, mechanical project manager, or engineer refrigeration.

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HVAC Engineer General interview questions

1. Why do you work as an HVAC engineer?
2. Why do you want to work for our company?
3. What are your career goals?
4. How would a recommender describe you?

HVAC Engineer job interview questions allow employers to learn about candidates’ backgrounds, including their career goals and how they approach challenges on the job. The right questions can reveal whether the interviewee is an ideal addition to your HVAC team.

HVAC or mechanical companies should develop an interview process to find the best technical candidates. Managers at McWilliams & Son Heat and Air Conditioning in Texas follow a multi-tiered hiring process to ensure they place new people in the right roles. Go through a thorough pre-hire vetting process, instead of finding out that the new hire isn’t the best fit for your business.

1. Why do you work as an HVAC engineer?

When hiring managers ask HVAC engineers why they work in the HVAC industry they will ask the classic “Tell me about yourself” question. This gives engineers the opportunity to share why they are passionate about HVAC engineering, what they love about their work and how they want to further their knowledge in the field.

Now is the time to ask questions about the candidate’s knowledge, education, overall HVAC skills, previous employers, licenses and certifications such as Certified HVAC Designer by the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE).

2. Why do you want to work for our company?

Find out if technical candidates understand your company and its core values. Candidates who research your company in advance show they know how to prepare and can clearly articulate how their values ​​align with your company’s mission.

Find out their expectations for an engineering position. What are their work schedule expectations? Are they comfortable working on-site? Do they have experience managing a team? Communicating upfront will set the right expectations for future success.

3. What are your career goals?

Learn about the candidate’s goals so you understand what motivates them and what they aim to achieve.
Do they just want to make more money than their previous HVAC design job, or are they interested in a long-term career path and learning more along the way? Depending on what your business can offer, either one may be suitable.

4. How would your references describe you?

HVAC engineers need to know what they are good at. Obtain a list of references so you know how the candidate has performed in their previous jobs, including information about their personality, their interactions with colleagues, and how they approach Difficult HVAC design projects.

Behavioral Interview Questions

1. How does your supervision prevent errors in projects?
2. How do you prioritize and delegate projects?
3. How do you handle interacting with an unhappy customer?
4. This is a specific HVAC design challenge. What steps will you take to resolve this issue?

While many HVAC engineer interview questions focus on technical aptitude, HVAC companies should ask behavioral interview questions to determine how candidates approach challenges on the job.

Experienced hiring managers actively listen to candidates’ responses so they can ask more probing questions. It’s also important to focus on how the candidate answers: do they answer the question directly or give a vague answer? Do they choose to respond in a negative, accusatory tone?

Even answers to seemingly spontaneous questions can reveal a candidate’s attitude, providing insight into how they view work, approach problems, and interact with other people.

1. How did your supervision prevent errors in the project?

A good HVAC engineer must know how to proactively minimize errors through supervision, communication, and strong accountability processes. Ask about the checks and balances they use to ensure projects meet appropriate specifications and how they communicate with other team members. Determine how they detect errors and what actions they take when errors occur.

2. How do you manage your time and delegate?

When managing multiple complex HVAC projects time management is key. How does the candidate decide what to focus on first? How do they delegate to subordinates? Knowing how to prioritize and reassign work when needed is crucial to keeping projects on time and on budget.

3. How do you handle a difficult customer?

If the HVAC engineer role involves customer interaction asking about a difficult customer service experience will show the candidate’s general attitude towards customers and the steps they take to deliver a good customer experience. Whether explaining an HVAC system design issue or communicating a change in the project schedule due to supply chain issues, clear communication and the right attitude is key.

4. This is a specific HVAC design challenge. What steps will you take to resolve this issue?

Asking questions about an unfamiliar HVAC design scenario gives HVAC engineering candidates the opportunity to demonstrate quick thinking and problem-solving skills. Their answers will demonstrate their critical thinking and level of understanding. Proper and efficient HVAC operation is essential. Knowing how to solve complex problems and coordinate projects effectively requires excellent communication and knowledge.

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Technical Knowledge Interview Questions

1. What was your most difficult project and what did you learn from it?
2. What are the pros and cons of VAV and CAV systems?
3. What is sensible and latent heat load?
4. How do you calculate heating and cooling loads?
5. What is your experience with green HVAC solutions?

As HVAC engineers work on complex tasks, candidates must have the right level of technical knowledge and skills.

Technical candidates must have in-depth knowledge of heating and air conditioning systems, including selection, sizing and configuration of air handling units (AHUs), fan coil units (FCU), air or water chiller and boiler. They must also have good understanding of refrigeration cycles and refrigerants.

HVAC design is based on psychometric principles. In addition to technical expertise, candidates must have knowledge of HVAC standards and guidelines. Ask questions based on technical skills to shortlist the candidates.

3. What is sensible and latent heat load?

In HVAC world, correct application of energy principles will give you a comfortable building environment. Sensible heat is air temperature, latent heat is air humidity. Calculations include measuring airflow in cubic feet per minute (CFM) so HVAC engineers can size the HVAC system accurately.

4. How do you calculate heating and cooling loads?

Sizing HVAC equipment based on heating and cooling loads requires following the right methods.HVAC load calculations shows the exact amount of BTUs (British Thermal Units) a space of a given size needs for heating and cooling. By definition a BTU is the amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit.

Ask candidate if he knows how to calculate residential zones in Handbook J, we are showing we are familiar with the process designed by Air Conditioning Contractors of America.

5. What is your experience with sustainable HVAC solutions?

Modern customers want new, sustainable HVAC solutions that benefit the environment and their wallets.
If your company offers services like geothermal, solar, or hydropower, ask about the candidate’s knowledge of these systems so you can continue to provide eco-friendly solutions and environment for its customers.

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Technology Interview Questions

1. How do you see mobile software in the HVAC industry?
2. What is your experience using mobile technology in the workplace?
3. What tools do you use to explain problems and solutions to customers?

Ask technology-related questions to see what candidates know about HVAC trends and cloud-based software, such as ServiceTitan HVAC software, used to streamline operations and improve communication next. Even if they don’t have experience, candidate feedback can help you determine whether they see the value that technology brings to the HVAC industry and are ready to use it in daily operations.

1. How do you see mobile software in the HVAC industry?

Engineers and project managers benefit from using HVAC job costing software to accurately track project costs, integrating financial data from sold estimates, public invoices jobs, orders, payroll and accounts receivable. These tools enable your HVAC staff to work better as a team and complete projects more efficiently.

2. What is your experience using mobile technology in the workplace?

Mobile technology allows the HVAC engineer or manager to easily view schedules, material and labor costs, and other important job information from anywhere. In terms of customer service, team members can promptly inform customers about the project. A seamless customer experience will result in more loyal customers and increased word-of-mouth referrals.

3. What tools do you use to explain problems and solutions to customers?

The HVAC project engineer or project manager can be the person who explains problems and solutions to clients, especially when recommending expensive proposals. When employees confidently use HVAC software to make the best recommendations, it gives customers a clear picture of their options and the benefits of each choice. They may decide that the “best” offer will save them more money in the long run.

HVAC Engineer Payroll (Salary) Interview Questions

1. What are your HVAC engineer salary expectations?
2. Have you ever worked for a company that pays based on performance?
3. What should you expect in terms of bonuses or Sales Program Incentive Funds (SPIF)?

Online job postings show demand for HVAC engineer jobs, ranging from 154,800 to 588 jobs, depending on the online job search site and the specific job title. Nationwide, employment for mechanical engineers is expected to increase by 12,400, or 4%, by 2029, according to the U.S. Bureau of Labor Statistics (BLS).

The HVAC sector remains competitive as more workers are retiring than entering the field, according to an organization looking to close the skills gap. Put your company at the top of the candidate list by offering competitive salaries and benefits as well as a positive company culture.

2. Have you ever worked for a company that pays based on performance?

If your HVAC company offers performance-based pay versus an hourly rate, candidates should understand your company’s salary structure and the impact of commissions and bonuses on the position. Using contractor timesheet software allows for real-time timesheet tracking and customizable performance pay, so you can tailor your compensation structure to achieve best results.

3. What do you expect in terms of bonuses or SPIF?

Ask about expectations of receiving bonuses or other incentives. Explain how your company values ​​employee performance and demonstrate how optimal performance translates into pay increases.