Use trees and shrubs to create windbreaks that intercept the prevailing winter winds and help reduce heating costs by up to 25%. One third of heat is lost from buildings by air seeping through cracks and other openings. High winds push cold air in through these openings increasing heat loss from buildings. Windbreaks slow the wind, reducing the amount of cold air entering your home. Create tall dense plantings for the best protection. And design your windbreak so you can benefit from the greatest reduction of wind speed that occurs two to five times the height of the wind break down wind.