Another popular green upgrade is insulation. It makes sense that adding more insulation will slow the transfer of heat into your home but unfortunately insulation is not a one-size-fits-all upgrade. If a home already has 6-inches of insulation the cost benefits of adding more diminish. Additional insulation will still save money on utility bills, but how much is the question. An ideal candidate would be a home as little or aging insulation where an upgrade would give the benefit of both increased comfort and energy savings. Often the more important issue is finding out how the insulation installed. A 5% defect in the installation will cut the R-value (its effectiveness) by 50%.
Upgrades such as radiant barriers, solar attic fans and additional insulation should be considered based on the conditions of each home. These are decisions that should be discussed with an energy auditor and it is always best to get a couple of opinions before a large investment is made.