BSE Ltd is Castolin Eutectics preferred service provider for our (HVAC) heating, process cooling, air conditioning, ventilation and process extract systems and has been since 2005.
This work includes the full consultancy, design and installation of completely new systems and the annual service and repair of existing equipment.
BSE Ltd offers the complete turnkey solution, honour their commitments, is very competent and offers an excellent emergency response service.
Based on the relationship that has developed between our companies I have no hesitation in recommending BSE Ltd to any prospective customer.

John Dalton

Director & CEO, Catolin Eurotic Ireland Ltd

I have worked with Denis, Colin and their team over numbers of years and have always found them to be thorough professionals across every facet of their engagement with our company. BSE Ltd are very reliable, have a quick response time, competitive quotations and have an excellent quality of workmanship and attention to detail.

BSE Ltd are a pleasure to work with and are led by highly proficient professional engineers.

Ger Keeley

Facilities Manager Murphy Ireland

Having known Denis from BSE Ltd I have found him to be a real professional and a person who is great to deal with

Kevin Dunbar

Building Services Manager, John Sisk & son Ltd

I can recommend Denis O’Neill and Building Services Engineering Limited for Consultancy, design, installation, service and maintenance of a whole range of air conditioning and mechanical engineering services

PJ Smyth

Product Manager, Castolin Eutectic Ireland Ltd

I have worked with Denis from BSE Ltd in the past & found Denis is a consummate professional.

Michael Wolf

Managing Director, Wolf Process Automation Ltd



I would like to thank you and the team for all your assistance from beginning to end – it was a pleasure to work with all of you. Also, when we presented the quotation to our landlord (a building firm) they were unable to find a quote that even came close to matching yours – despite the range of contacts available to them in the industry. If you ever need a reference for future work, I would be more than happy to
recommend your work here, or you can refer directly to this letter.

Richard Meade

Chief Operations Officer, Amartus Ltd


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...