I am in the process of running thru the Canadian EnerGuide for Houses program. Just insulated the Attic from 0 to R60, and replaced all of my windows. We noticed an immediate change once we changed the two old windows in the basement - a testament to the value of basement air leakage remediation. We are now insulating the basement walls to R23, with a spray foam applied to the sill plate, R 10 blue foam board to the walls and stud walls and fiberglass/ 1/2 drywall on top. Total bill for the basement and spray foam under two porch/crawlspaces was around $4300 The beauty is that the program up here will rebate me up to $2000 for the R23 basement walls alone, pro rated based on percetage of coverage! In the end, I expect to get enough of a rebate to easily pay for the labor part of the insulation bills. Any Canadians out there who haven't looked into the program, just Google the Energuide for Houses program and check it out - even includes a rebate for upgrading to an EPA wood stove, and more.