Older equipment used R-12. New stuff is 134-A. R-12 would get a lot colder and 30* was a very normal differance. 134 may do it on a system designed for it but not an older converted system. See how cold the freezer in your fridge can keep ice cream. Now it is Zero. Used to be -10 or 15. You are going to get at least a hundred opinins but both of my neighbors do AC and I work with several HVAC guys at work. The older R-12 and 502 and such worked better. Thank the enviro clowns. REAL refrigeration uses Amonnia. That stuff gets REALLY cold. It will also kill ya.
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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