I would think the logistics of mounting the sail and keeping it in place during winds and such would place a high cost on the assembly. I once , for 50 years, lived in north eastern Ohio and found the most effective cost savers to be insulation, windows, and drafts, adding and eliminating. I had about 30" in attic, added insulation to the upper 4' of the basement walls, and spent a great deal of effort in eliminating air leaks, not only air coming in but air leaking out of duct work in the basement. Buy a tub of duct seal and some sealing tape ( the silver thin stuff), not duct tape as it will peel over time.
A ridge vent in the roof with some soffit ventilation helped a good deal as well in conjunction with the added attic insulation.
Last edited by jlaw; 05-09-13 at 09:11 AM..
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