Energy Saving:

The essential components of a building affecting Energy Efficiency are:

Insulation.
Glazing.
Boilers - Condensing. (Gas & Oil)
Bio-fuel Boilers.
Heat Pumps.
Solar Collectors.
Heat Recovery and Ventilation Extraction Systems.
Passive Stack Ventilation. PSV.
Low Energy Lighting.
Rainwater Harvesting Systems.

The manner or order in which these components are used, installed or addressed is crucial to a high Building Energy Rating. It is a very complex matter and there is an endless supply of product information available from manufacturers at present. This information must be studied and used carefully in order to achieve the desired result. New and better products are coming to the market almost daily. The COP (Coefficient of Performance) is the critical factor to be considered in choosing a Heat Pump. A product can be installed with a solar panel that avoids the need to change a hot water cylinder. There are solar collectors that can be used to heat and cool the air taken into a home. ECO2 can help advise you on installations and efficencies.

Independent information of Energy Saving may also be viewed on following websites.

www.sei.ie
http://www.environ.ie/en/Environment/
https://www.esb.ie/main/energy_business/energy_intro.jsp