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A third way to control the pollution level in a house is to exhaust spaces Indoor Air Usually Is Dirtier Than Outdoor Air where contaminants are produced, such as Because indoor air starts as outdoor air, then cally diluted with controlled whole-house grows more polluted from contaminants in a house (see “Indoor Air Pollutants,” p. 32), kitchens, laundries, utility/storage rooms, and bathrooms. But even after you’ve isolated, eliminated, and exhausted, there are still pollutant sources that are most practiventilation.

Of closed-cell spray foam for a total of R-37 Roof: Attic floor air-sealed and filled with 17 in. of loose-fill cellulose for an R-value of 60; 2 in. of spray foam used to air-seal the eaves Windows: Main house windows are double-glazed, low-e, argon-filled units by JeldWen®; basement windows are double-glazed hopper units by Harvey Industries Water: 60-gal. 25kw package system by Nexamp™ Results Energy reduction: From $5,650 per year to $3,160 per year Annual savings: $2,490 Payback period: 60 years A Practical Look at Deep-Energy Retrofits 45 insulation 2 Upgrade Your Attic Insulation BY MIKE GUERTIN S aving money on heating-fuel costs is a I typically focus my efforts to improve lot simpler than negotiating with OPEC the energy efficiency of an attic in two areas: or your local utility.

The historic commission did, however, allow us to remove and replace the siding and windows on one wall where the siding was damaged and needed replacement, so 3⁄4-in. Open-cell spray foam (R-40 in the rafters; R-14 in the walls) Housewrap 26 Energy Ef ficiency strips furring Wood siding we injected open-cell foam, added housewrap and furring strips, and replaced the siding on that wall. Historic commissions all over the country favor historical authenticity over durability and energy efficiency with regard how much insulation do you need?