When people build a house, they must pay attention for any detail including future energy usage. They could not only focus on the design or budget of course. Energy usage consideration for house building is very important because it could influence future energy expense as well as the environment. As people knew, they could enjoy the electricity because it is produced with support of natural oil which also could produce residue including CO2. A lot of CO2 in the atmosphere could make green house effect which could danger the living on the planet surface.

For greater environment purpose, people could apply the right window which could help them to bring natural light into their house especially at day time. There are some houses which apply wrong window which make them have to switch on the light which is used electricity even at day time. Of course, this could not be economical because they have to pay for something which could be replaced by something free. More electricity usage could bring more dangerous damage for environment in the future of course.

Simple thing like window design could bring great difference to environment and financial situation.