Reduce your heating bills Free heat from the sun

摘要

If your roof isn't too cluttered with solar hot water or solar electricity panels, then you have a cheap resource available to improve the comfort of your home. If your house has been correctly insulated at the ceiling plaster level (not at the roof line level) none of the sun's heat will get through the ceiling to warm your home in winter-unless you actively transfer it into the living space. The average Australian roof receives 220,000 kilowatt-hours of solar energy every year. In Melbourne, the range is from about 1200 watts per square metre in summer to about 600 watts per square metre in winter.