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Air Conditioning is the precise control of air temperature, cleanliness and humidity. It works to provide a comfortable and relaxed atmosphere. Systems can offer you heating in the winter and cooling in the summer. With all systems, the air is cooled or heated by circulating it through an Air Conditioning unit, as per the diagram opposite.

To ensure that you receive the very best from your system, we offer a professional, free, no obligation site survey, which will establish the few basic facts needed to ensure you receive the correct system; this will include the following;

  • Room Size

  • Amount of people

  • Any machinery

  • Location of both Indoor and Outdoor Units

  • Power Supply

In the summer months when an area gets hot, heat is absorbed by Refrigerant, which is sealed within the unit. As the Refrigerant absorbs the heat from the room, it changes to a gas and passes through small copper tubes to the outdoor unit. Where the heat is released into the atmosphere.

The gas then changes back into a cold liquid, which returns to the indoor unit, where the air is fanned and then distributed out into the room, providing the cool air you require when the temperature rises. This process is automatically repeated to maintain the pre set room temperature, which you control. The Filters in the Air Conditioning systems are extremely effective at removing air borne contaminants, which include dust and pollen.

For further information on any of our product range or services for work or office use, please don't hesitate to contact us.



In an office environment, cool cleaner air improves staff morale, efficiency and productivity.

In leisure or retail sectors, customers will stay in a comfortable environment.

Finally, in the summer heat, cool customers are happy customers. Happy customers stay longer and spend more money!!

Air Conditioning within the workplace has been common for many years, only now it offers various ranges, sizes and the ability to cool and heat.

The systems are able to comply with a variety of layouts, all designed to meet your needs.

Premiair Refrigeration & Air Conditioning Ltd can supply, install, and maintain systems for all commercial properties, inclusive of offices, shops, restaurants, factories etc. Our expert surveyors are able to find a solution to all of your heating/cooling needs, and will deliver what you require on time and within budget. We will always advise of a total cost inclusive of all materials, so each client is aware of the project total. We do not add any additional or hidden costs!


Throughout the whole year, even when outside temperatures plummet, server rooms are always humid, with unbearable and uncomfortable temperatures, which are given out as "heat loads" from the machines located inside. Everybody knows how much heat that computers give out. Computer Rooms or Data Rooms whether in Offices, Libraries, Schools or Universities all need to be correctly Air Conditioned to maintain a comfortable working environment for computer users. Premiair Refrigeration & Air Conditioning Ltd can design, install and maintain Computer Room Air Conditioning Systems.


This system consists of an Evaporator and a Condenser Unit.

The Evaporator unit is located indoors, and is usually mounted on a wall, floor or ceiling. This unit circulates the air in the room cooling and heating it to your set requirements. It is then connected to the Condenser unit, which is located outside via copper pipes. The heat removed from this room is dispersed into the atmosphere.

When heat is required, the system works in reverse.


Operation is the same as above, but this option allows for up to 4 units to be positioned in various rooms, allowing individually controlled units, which all operate for a single outdoor unit.


Variable Refrigerant Flow systems are the most up to date development. The operate in the same way, but are able to give you the option to run up to 16 indoor units form a single outdoor unit.



For any inquiries, please call: +44 28 7128 0711 or fill out the following form

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Head Office

Unit D2 Balliniska Business Park, Springtown Ind Est, Derry, BT48  0NA

Tel: 028 7128 0711

Fax: 028 7128 1737

Get a quote: +44 2871280711


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