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Heating and Insulation Energy Facts


  • Switch off heating in areas of the office that are not in use.
  • Close windows to conserve energy
  • A typical window left open overnight in winter will waste enough energy to drive a small car over 35 miles. 


  • Lowering the temperature of your rooms by 1 degree
    • Saves the environment an annual emission of 230 kilos of CO2
    • And as much as 10% off your bill.   
  • Don’t overheat your building - The maximum recommended temperature for most buildings is 19ºC
  • For heating, it’s usually more efficient to use a lower temperature setting for a longer time. This is cheaper and more comfortable than running heating for short bursts at high temperatures.
  • ThermostatSet hot water thermostats to 55-60°C maximum. There is no point overheating water to the point where you have to cool it down before you can use it!
  • A boiler 15-20 years old may only be around 65-70% efficient, however…
    • A modern high-efficiency boiler = 75-80% efficient
    • A condensing boiler 90-95%.
  • Therefore, you could potentially reduce your heating bills by up to 40% just by replacing an old, inefficient boiler with a new condensing boiler. (top tips)


  • Electricity consumption in an air-conditioned office is up to 2.5 times greater than in a naturally ventilated office.  


  • The cost of fitting lagging on your hot water cylinder and pipes can be recouped in 2–3 months, saving more than 30% of your heating costs. 
  • A 80mm lagging jacket can save you €2.50 a week and costs about €14 to buy. 
  • 40% of all heat lost in the average home makes its escape thru the attic or walls.
  • Insulating the 50 sq.m. attic space of a typical house costs around €254 and could save approximately €76 a year, paying for itself in about 3 years.  
  • Re-insulation of a house of 120m2 can save the environment 4,900 kilos of CO2 a year. 
  • Ensure your building is well insulated and draught-proofed.
  • Weatherseal doors and windows not regularly used. Consider secondary or double glazing.

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