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Jack McCulloch
Business Consultant
Hundreds of 'Excellent' reviews
Helping HVAC companies unlock their next stage of growth
Specialisms We Cover
The global HVAC market continues to grow steadily, driven by urbanisation, energy-efficiency regulation, and rising demand for advanced cooling — including refrigeration and data centre thermal management — across residential, commercial, and industrial environments.
HVAC, refrigeration, and data centre cooling systems are fundamental to modern building performance, operational resilience, and energy efficiency. Beyond occupant comfort, these technologies underpin critical infrastructure, including hyperscale and edge data centres. As regulations tighten and sustainability targets increase, manufacturers and service providers are under increasing pressure to deliver highly efficient, low-carbon cooling and refrigeration solutions. Innovation across HVAC, industrial cooling, thermal management, controls, and building management systems continues to transform the sector.We work with HVAC organisations across manufacturing, distribution, installation, and service. Our expertise spans engineering, operations, project delivery, and commercial leadership, enabling us to support businesses operating in both new-build and retrofit markets. By securing specialist and leadership talent aligned to technical and regulatory requirements, we help our clients scale, innovate, and deliver high-performing HVAC solutions in a rapidly evolving market.
Comfort, efficiency, and compliance are engineered outcomes.
Organizations in this sector design, manufacture, and deliver systems that must operate reliably across long asset lifecycles. Projects are shaped by energy standards, installation complexity, and ongoing maintenance requirements, placing emphasis on technical coordination and practical delivery.Successful hiring in HVAC comes from understanding how systems are specified, installed, and supported over time. Aligning businesses with professionals who have worked across design, manufacture, and site environments helps ensure long-term performance and operational continuity
Team
Jack McCulloch
Business Consultant
Robert Hambidge
Director
Did you know?
Hiring the wrong candidate costs more than just time—it can waste salary, training resources, and opportunities. The Department of Labour estimates a bad hire can cost up to 30% of the role’s first-year earnings.
We hire right
Organisations are
97% Placement Rate 11.78:1 CVs Sent to Interviews 2Avg. 32 Day Engagement to Placement 3
1. Based on all roles engaged on by a client on an exclusive basis from Jan 4 2025 - Dec 31 2025.
2. All CVs Sent from Jan 4 2025 - Dec 31 2025.
3. From Jan 4 2025 - Dec 31 2025.
Stats
1,908 placements made across 25 sectors
262,736 companies in our CRM
"At Irving Knight, we don't just fill positions; we build lasting partnerships. Our commitment to understanding your unique needs ensures that we deliver leaders who drive success and embody your company's values. When it comes to identifying the high-performers of tomorrow, there is no one-size-fits-all solution. Our bespoke approach ensures every search is personal, diverse, and tailored from the ground up — delivering an individual, unrivalled experience for both clients and candidates. "
- Joe Davey, Group CEO of Irving Knight Group
Dipen Shah
Account Manager, Canada
I was assisted by Aiden Kerr on getting a new job in the chemical industry. He was fantastic in terms of timing, comm...
Aidan Kerr
Chemicals
Joerg Schlagmann
Senior Global Manager
Great expert: supportive, challenging and always empowered for his customers and his work! Not more to say: just exce...
Joseph Davey
Group CEO
Anja Florbach
Digital & Commercial Excellence Manager
Thank you so much Joseph! You have given me a great support. It was really nice to be in contact with you and I thin...
Joseph Davey
Group CEO
Rishi Sarkar
Environmental Process Engineer, US
Irving Knight helped place me with a company that I could have a positive impact on that aligned with my career goals...
Cian ODonnell
CDMO & CRO
Vincent Dehousse
Head of Sales & Marketing, Netherlands
Great experience working with Cian from Irving Knight—professional, responsive, and genuinely supportive. Highly reco...
Cian ODonnell
CDMO & CRO
Nathan Radue
Channel Marketing Manager, US
Oliver is a thorough and effective recruiter, representing both sides with character and solid communication. He appr...
Oliver Kiddy
Flavors & Fragrances
Kaitlin Lammers
Account Manager
Oliver made the hiring process smooth from start to finish. He was consistently responsive, understanding, and suppor...
Oliver Kiddy
Flavors & Fragrances
Matt Engelbrecht
VP Industrial Ops, US
Working with Lily was a phenomenal experience. She was fully transparent, professional, and provided timely communica...
Lily Newton
Animal Health
Nika Kuchaidze
Senior Continuous Improvement Chemist, US
It was a pleasure working with Joseph on transitioning to a position with a new company. Communication was prompt,...
Joseph Davey
Group CEO
Valeria Pozzi
Procurement Category Manager, Italy
Working with Oliver has been a real pleasure!His highly professionalism and transparency made me comfortable to consi...
Oliver Kiddy
Flavors & Fragrances
Rania Metwall
Head of Sales, France
Would highly recommend working with Luca Dowdell. He helped me find the perfect job. Very professional, friendly and ...
Luca Dowdell
Lubricants, Oil & Gas
Ashley Maclean
Systems Sales Engineer, South Carolina
Jack Purnell with Irving Knight was the best recruiter I’ve worked with - by far. He communicated clearly, was respec...
Jack Purnell
Material Handling & Automation
Tim Mitchell
Plant Manager, US
Stewart did an amazing job representing me for a new opportunity.
Stewart Boyd
Construction Materials & Mining
Guillermo Leal
Global Director of Pricing, US
I've worked with a few recruiters in the past but Oliver surprised me not only for his professionalism, excellent com...
Oliver Kiddy
Flavors & Fragrances
Andrew Coutts
Director Global Strategy, US
First Class Service Emma shared details of a relevant opportunity and did a great job helping to manage lengthy nego...
Emma Conlin
Animal Health
Todd McBroom
District Sales Mgr, US
Great Experience!! This was my first time dealing with a recuiter and could not have been a better experience. Jack ...
Jack Purnell
Material Handling & Automation
Jeff Borchardt
Director of Planning, US
Mr. Clay was a wonderful recruiter. He was communicative and helped keep me informed through the process. He also fou...
Christopher Clay
Real Estate & Homebuilding
Lucas Quadflieg
Sales Manager, Netherlands
Good vibes on finding a new opportunity... I was contacted by Aidan Kerr for a position of Sales Manager Benelux. Af...
Aidan Kerr
Chemicals
Kerry Maye
Regional Sales Manager
Working with Joseph was a wonderfully positive experience from our first contact, through acceptance of my job offer....
Joseph Davey
Group CEO
Franz-Leo Nedo
Territory Sales Manager
Joseph is an expert in recruting people. He has in-depth practical knowledge and helpful by solving potential issues....
Joseph Davey
Group CEO
Dipen Shah
Account Manager, Canada
I was assisted by Aiden Kerr on getting a new job in the chemical industry. He was fantastic in terms of timing, comm...
Aidan Kerr
Chemicals
Joerg Schlagmann
Senior Global Manager
Great expert: supportive, challenging and always empowered for his customers and his work! Not more to say: just exce...
Joseph Davey
Group CEO
Anja Florbach
Digital & Commercial Excellence Manager
Thank you so much Joseph! You have given me a great support. It was really nice to be in contact with you and I thin...
Joseph Davey
Group CEO
Rishi Sarkar
Environmental Process Engineer, US
Irving Knight helped place me with a company that I could have a positive impact on that aligned with my career goals...
Cian ODonnell
CDMO & CRO
Vincent Dehousse
Head of Sales & Marketing, Netherlands
Great experience working with Cian from Irving Knight—professional, responsive, and genuinely supportive. Highly reco...
Cian ODonnell
CDMO & CRO
Nathan Radue
Channel Marketing Manager, US
Oliver is a thorough and effective recruiter, representing both sides with character and solid communication. He appr...
Oliver Kiddy
Flavors & Fragrances
Kaitlin Lammers
Account Manager
Oliver made the hiring process smooth from start to finish. He was consistently responsive, understanding, and suppor...
Oliver Kiddy
Flavors & Fragrances
Matt Engelbrecht
VP Industrial Ops, US
Working with Lily was a phenomenal experience. She was fully transparent, professional, and provided timely communica...
Lily Newton
Animal Health
Nika Kuchaidze
Senior Continuous Improvement Chemist, US
It was a pleasure working with Joseph on transitioning to a position with a new company. Communication was prompt,...
Joseph Davey
Group CEO
Valeria Pozzi
Procurement Category Manager, Italy
Working with Oliver has been a real pleasure!His highly professionalism and transparency made me comfortable to consi...
Oliver Kiddy
Flavors & Fragrances
Rania Metwall
Head of Sales, France
Would highly recommend working with Luca Dowdell. He helped me find the perfect job. Very professional, friendly and ...
Luca Dowdell
Lubricants, Oil & Gas
Ashley Maclean
Systems Sales Engineer, South Carolina
Jack Purnell with Irving Knight was the best recruiter I’ve worked with - by far. He communicated clearly, was respec...
Jack Purnell
Material Handling & Automation
Tim Mitchell
Plant Manager, US
Stewart did an amazing job representing me for a new opportunity.
Stewart Boyd
Construction Materials & Mining
Guillermo Leal
Global Director of Pricing, US
I've worked with a few recruiters in the past but Oliver surprised me not only for his professionalism, excellent com...
Oliver Kiddy
Flavors & Fragrances
Andrew Coutts
Director Global Strategy, US
First Class Service Emma shared details of a relevant opportunity and did a great job helping to manage lengthy nego...
Emma Conlin
Animal Health
Todd McBroom
District Sales Mgr, US
Great Experience!! This was my first time dealing with a recuiter and could not have been a better experience. Jack ...
Jack Purnell
Material Handling & Automation
Jeff Borchardt
Director of Planning, US
Mr. Clay was a wonderful recruiter. He was communicative and helped keep me informed through the process. He also fou...
Christopher Clay
Real Estate & Homebuilding
Lucas Quadflieg
Sales Manager, Netherlands
Good vibes on finding a new opportunity... I was contacted by Aidan Kerr for a position of Sales Manager Benelux. Af...
Aidan Kerr
Chemicals
Kerry Maye
Regional Sales Manager
Working with Joseph was a wonderfully positive experience from our first contact, through acceptance of my job offer....
Joseph Davey
Group CEO
Franz-Leo Nedo
Territory Sales Manager
Joseph is an expert in recruting people. He has in-depth practical knowledge and helpful by solving potential issues....
