1990, 7 EU Member States; 1991 to 1994, 12 EU Member States; 1995-96, 14 EU Member States; 1997 to 2003, 15 EU Member States; 2004, 21 EU Member States; 2005-06, 25 EU Member States; 2007 to 2010, 27 EU Member States
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Look for ways to reduce the energy consumption for heating and cooling, for example by sealing windows and doors, insulation or changing the windows. Today it is possible to build ‘carbon neutral’ houses.
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