BSE Air Conditioning & Refrigeration is a division of Building Services Engineering Ltd (BSE Ltd.) which was founded in 2005.

BSE Ltd. is a multi- disciplined company offering a wide range of services including: Heating, Ventilation, Air Conditioning & Refrigeration (HVAC) and Mechanical, Electrical, Plumbing equipment (MEP) and Fire Safety Engineering.

Who are we

BSE Air Conditioning & Refrigeration ‘s core business is Air conditioning, Refrigeration, Ventilation and Mechanical services (HVAC). We specialise in the design, supply, installation, service, repair and maintenance of a whole range of Air Conditioning and Refrigeration equipment.

All BSE Air Conditioning & Refrigeration Engineers are highly trained, fully competent, operate within a strict professional code of conduct and are fully F-Gas Compliant. All our Heating engineers are registered RGI gas installers. The NSAI auditors certify BSE protocols on an annual basis. We constantly update our engineers with product development training so that we remain experts in our field.


Our engineers are trained to the highest level to install, service and maintain a wide range of air conditioning and refrigeration equipment. As new products come online we and our partners continue to update our engineers with product development training so that we stay at the top of our game.

Our Consultant Engineers are some of the most experienced, academically and hands-on engineers in Ireland.
Along with professional qualifications our consultant engineers have worked at all levels of involvement from design, equipment selection, site installations and commissioning of a whole range of HVAC engineering projects.

Our Leadership

Denis O’Neill

Denis O’Neill is a Chartered Engineer qualified with an Engineering degree from the University of Limerick (NIHE) in 1988 and a Master’s degree in Building Services Engineering from Brunel University London, England.

He has worked in the building services industry for over 30 years specialising in heating, ventilation, air conditioning, refrigeration and is a non-domestic BER assessor. He is an accredited data centre designer. He is a Consultant Engineer specialising in air conditioning design, HVAC inspection and design & build projects.

He is a full member of Chartered Institute of building services engineers (CIBSE), Engineers Ireland (IEI) and ASHRAE.

Contact Denis at info@bse.ie or 01 6016 434

Colin McCready

Colin McCready  is a qualified air conditioning and refrigeration engineer with over 25 years experience within the commercial and industrial sector. 

He holds a City & Guilds qualification in refrigerant handling and thermal imaging. He supervises all our gas installations and is RGI registered. He is a member of the Institute of Refrigeration (IOR).

Contact Colin at colin@bse.ie or 016016434

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Mission Statement

Our vision is that BSE Air conditioning and Refrigeration will become the leading provider of heating ventilation and air conditioning (HVAC) systems throughout Ireland able to provide all our clients with a standard of services second to none.

Our mission is not only to meet – but also exceed – client expectations with professionally competent teamwork, continuously updating our engineers’ training and focused understanding of our customers’ needs.

As a progressive organisation, we will achieve this goal through technical excellence to ensure product dependability – and continued long-term customer satisfaction.

Health and Safety

BSE Air conditioning and Refrigeration is committed to the provision of a Safety, Health & Welfare and Environment and the continuous improvement of Occupational Safety, Health and Environmental matters for employees, customers and Visitors

BSE Air conditioning and Refrigeration commitment to ensure that as far as reasonably practicable the company will comply with the Safety, Health and Welfare at Work Act 2005 and all other Legislation applicable to BSE Air conditioning and Refrigeration.

When Standards Count

BSE air conditioning & Refrigeration is accredited by the National Standards Authority of Ireland (NSAI) and is audited annually to ensure we maintain our high standards. Our commitment to quality and accountability is a commitment and accountability to you the client.


  • I.S EN ISO 9001:2015 Quality Management System
  • IS EN ISO 14001:2015 Environmental management system
  • OHSAS 18001: 2007 Occupational Health and Safety


The successful candidate will be offered a four-year Air Conditioning and Refrigeration Apprenticeship. Minimum 39 hours per week. Should have excellent communication skills. Must have an aptitude and interest to work with hand tools and specialised air conditioning...


POSITION BSE Air Conditioning & Refrigeration are recruiting a qualified air conditioning and refrigeration engineer to be part of a team that service, maintain and install a wide range of (HVAC) heating, air conditioning, refrigeration, and ventilation equipment....

Denis O’Neill Chartered Engineer

Denis O’Neill Chartered Engineer

Congratulations to Denis O’Neill from BSE air conditioning who was conferred as a chartered Engineer with Engineers Ireland. He is also a full member of Chartered Institute of Building Services Engineers and ASHRAE. The conferring of parchments confirmed the...

Join BSE Sales Team

Join BSE Sales Team

We are now seeking an enthusiastic, energetic & experienced Technical Sales/ Contracts Engineer to join our team. This role requires a target driven & motivated individual who displays excellent communication...

Save on Energy Cost with Free Cooling

Save on Energy Cost with Free Cooling

Over the last few years we have completed several chilled water installations system which when combine with dry coolers allow for partial or even totally free cooling and have given our clients many financial benefits. We have reduced the running cost of our clients...

Does your chiller or dry coolers need Antifreeze and Inhibitors?

Does your chiller or dry coolers need Antifreeze and Inhibitors?

As temperatures start to drop, you should check your glycol levels. Your water chiller and dry cooler systems can suffer serious damage when exposed to freezing ambient conditions. Now is the time to have your chilled water system and dry coolers checked for the...

BSE Air Conditioning is ready for R32 refrigerant!

BSE Air Conditioning is ready for R32 refrigerant!

BSE air conditioning has just installed several new Daikin R32 air conditioning units into the offices of a Dublin pharmaceutical company. The feedback from the client was very positive and there are now plans to upgrade all their older air conditioning units and go...

Thinking of becoming a Building Services Engineer?

Thinking of becoming a Building Services Engineer?

So, what do we do? My name is Denis O’Neill and I am a Building Services Engineer specialising in mechanical, electrical and plumbing (MEP). I have worked in this industry for nearly 30 years and own my own business, Building Services Engineering Limited. I am a...