While many new homes are already well insulated, older ones are probably due for a repackaging. According to the Dept. of Energy, your home's insulation hot spots are:
- The attic, including the attic door, or hatch cover.
- Under floors, above unheated spaces, around walls in a heated basement or unventilated crawl space, and on the edges of slabs-on-grade.
- Exterior walls, when constructing a new house or remodeling or re-siding your old one.
Before you decide to go about doing it yourself, get a quote from a local contractor to see if that makes sense, or cents. The cost of the insulation material alone might be roughly the same as having someone do the entire job for you.