Weatherization
The work is barely visible afterwards.
I'm sure there are other excellent weatherization companies, although it took some effort to find Capital Weatherization. A company that advertises that it can provide expert weatherization or that it participates in the Ameren ActOnEnergy program may not in fact be up to the task. There are two key tools that a serious weatherization company will use: a blower door and an infrared camera. If these tools are used in the first analysis of your house, that’s a good sign. A blower door is a big fan placed in your front entrance that pulls air out of the interior. One can use this to find the places where air is infiltrating from the exterior. An infrared camera gives an accurate measurement of the temperature of the walls and is used to find places where the insulation is substandard. Using a blower door and an infrared camera together is the most effective way to find out where cold (or warm) air is infiltrating.
An infrared camera gives an accurate measurement of wall temperature and can aid in the analysis of both insulation and air leaks.
In addition to adding dense-pack cellulose to the walls, the Capital Weatherization team added a thick layer of loose-pack cellulose to the attic. However, before they did this, they diagnosed and corrected a major air leak in the attic floor that was not evident to the unaided eye. This was a major issue and could easily have been overlooked by a less thorough weatherization contractor. Loose-pack cellulose is a better insulator than dense-pack cellulose, so it is preferred if air sealing is not an issue. I chose to have the loose-pack cellulose covered with a floor, which added to the expense, but gives me an attic that can be used for storage.
Another benefit of adding insulation to the attic is that it covers the ducts that were formerly exposed to the attic air temperature. This makes the heating and cooling system more efficient, because there is less heat loss or gain as the air moves through the ducts.
Colonial Solar House has a wooden flooring system that is supported by a rim joist. This 1-1/2-inch thick joist is all that separates the basement from the exterior and is thus a weak spot in the home's thermal envelope. Capital Weatherization coated the rim joist in the basement with closed-cell foam (also called two-part foam), which brings the joist insulation effectiveness up to the same level as that of the walls; it also adds air sealing.
You can get a home energy audit from an independent third party for $50 or contact a weatherization contractor directly. Start at the Ameren ActOnEnergy Residential web page. You'll find that there are attractive financial incentives for weatherizing your home, which are taken directly off your bill from the weatherization contractor. It’s a great deal for the homeowner!
What does it cost?
This step is an investment with a great rate of return, thanks in part to the incentives offered by the Ameren Illinois Savings website. In my case, the amount I would save in utility bills per year would be about 10% of the amount I paid out-of-pocket for the weatherization. Not only that, this return is tax-free and ignores any increase in energy prices. If I had skipped the installation of a floor over the attic insulation, my annual return would have been 17%.
Decreasing your utility bills has the added benefit of increasing the resale value of your house. Debby Auble of Ward and Associates (from whom we bought our house many years ago) tells me that most home buyers today care about utility bills (as any rational buyer should).
Weatherization also brings added comfort: the furnace or air conditioner come on less often, the temperature of the house stays better balanced, and drafts are eliminated. If insulation is added to the walls, it significantly decreases the street noise in the house.
Expect to spend a few thousand dollars out-of-pocket, depending on the extent of weatherization. If you don’t have the funds available, you can borrow against the value of your home via a Home Equity Line of Credit or a Home Equity Loan.