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According to the EPA, there are several ways to improve cooling in residential buildings. The current trend in home building is toward energy efficiency and green construction. Knowing what types of money savers and environmentally friendly options to offer can give contractors more business: Insulation is the most obvious investment. Look for insulation with a high R-value (insulating capacity) to keep the attic cooler during warm weather. Note that it’s easier to install insulation during home building or roofing. Photovoltaic (PV) solar panels use light to generate power. PV systems are becoming more affordable, but check to see if there...