Yeah Rick in my little corner of the world when a 75K BTU output would do they will put in a 100K BTU output because there is so little difference in price. And then they will put in a highly restrictive filter so now because the ductwork is too small and the filter is too restrictive there is no way the blower can move sufficient air and the furnace starts out it new life by overheating the heat exchanger, in addition if the gas pressure does not get set correctly and the gas valve does not get converted properly if it is an LP application so the problem compounds.
For a few years I did static pressure duct studies on every system that I worked on and found, that in my area at least, about 70% of the systems had undersized ducting especially on the return air side. That included even new systems.
Now I have to be perfectly honest and admit not all of these were DIY installs but many were done by professionals and in some cases the furnace was sized correctly but the duct work was not.
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Today's Featured Article - Harvestin Corn in Southern Wisconsin: The Early Years - by Pat Browning. In this area of Wisconsin, most crops are raised to support livestock production or dairy herds in various forms. Corn products were harvested for grain, and for ensilage (we always just called it 'silage'). Silo Filling Time On dairy farms back in the 30's and into the first half of the 40's, making of corn silage was done with horses pulling a corn binder producing tied bundles of fresh, sweet-smelling corn plants, nice green leaves with ear; the
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