Anytime you get the insulation up to superinsulation ratings and seal up the leaks to match, you need controlled heat recovery ventilation.
Its hard to retrofit, but superinsulation pays better than anything you can do to a house to control its energy consumption.
I'm not sure I like the Icynene product. The local vendor is hard to get along with, but I'm concerned that it prevents the encased wood parts of the struccture from breathing and so keeps them from drying and that can lead to rapid rot.
It also costs about three times per board or cubic foot of what fiberglass costs, and isn't the greatest R-value foam available but makes its claim to greatness on the fact it sticks to and seals all gaps that would be heat leaks in poorly installed fiberglass or foam boards. In fact that claim they make stronger than the real R value.
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Today's Featured Article - Massey Ferguson 35 (and up) Tractor Assembly Notes - by Jack Wetmore. These assembly notes are for Massey Ferguson tractors with a two stage clutch and 6 speed, 8 speed and mutli-power transmissions. I see a lot of discussion forum messages regarding damaged clutches from improper assembly. The objective is to have the engine and transmission slide together safely and easily until the gap between the two halves is less than 1/4", BEFORE tightening any of the bolts holding the two together. Using bolts to draw the two halves together will damage the PTO
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