Denis O'NeillDenis O’Neill is a chartered engineer (CEng), qualified with an Engineering degree from the University of Limerick in 1988. He has worked in the building services industry for over 27 years specialising in heating, ventilation, air conditioning, refrigeration and is a non-domestic BER assessor. He also holds a Master’s degree in Building Services Engineering from Brunel University London. He is an accredited data centre designer. He is a consultant engineer  and a member of the Chartered Institute of Building Services Engineers (MCIBSE) and Engineers Ireland (MIEI) specialising in design and build projects. email:



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 at John Sisk & Son Ltd

I have worked with Denis from BSE Ltd in the past & found Denis is a consummate professional.
Michael Wolf, Managing Director at Wolf Process Automation Ltd

BSE Ltd is Castolin Eutectics preferred service provider for our heating, process cooling, air conditioning, ventilation and process extract systems and has been since 2005. This work includes the full design and installation of complete 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 Castolin Eutectic Ireland Limited

Colin McCreadyColin McCready qualified as an air conditioning and refrigeration engineer over 20 years ago. 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. Email