Our guy spent several hours going through the entire house, from attic to basement, checking for cold air leaks and related insulation concerns. AT the end, he talked with me about everything he found and later sent a written overview of the test results along with a detailed work proposal for addressing each concern.
I was impressed with how thorough this energy audit was -- especially the part where he hooked up a giant fan that pulled air out of the house and identified areas (e.g., around windows and ceiling lights) that were leaking air. Most of our problems showed up in the attic (too little insulation) and basement (too little insulation in rim joist). I learned lots.
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