The recommended R value for insulation varies depending on the climate and type of building. In general, a higher R value is better for energy efficiency. The U.S. Department of Energy recommends R values between R-49 and R-60 for attics, and between R-13 and R-21 f...
Utility Expenses An even bigger problem with older homes is theheating and cooling billsthat come attached to these homes. Most of these homes were built at a time when energy was extremely cheap and insulation technology was in its infancy. Many of these homes are also using inefficient boiler...