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two items for discussion

First let me make it perfectly clear that I love wet heat, just stuck in the deep south. Much has been said about scorched heat and hi volicty systems. I would dare say that over 90% of all the duct heat and air put in over the last 30 years was never sized properly or installed properly in our area. The majority of all load calculations done or grossly oversized. What do you expect, when all the poeple and different groups offer a way to do a load with a so called built in fudge factor. Acca, Trane, Carrier are all the same, they have a built in factor. The way loads were done by G.E.,Trane and Carrier 30 years ago are now called old fashion, time consuming; but were very accurate. You designed the equipment per the load and what the owner wanted. If they wanted to maintain 70 degrees when it was 95 degrees outside, or design it for 75 degrees inside when it was 90 degrees outside. Big difference in tonage and operating cost. What region you live in makes a huge difference. By the way heatpumps were first used by supermarkets in the north region in the early 50's . The wasted heat from the ref equipment was piped into the stores to help heat the stores in the winter and at the same time keep the ref units from freezing up. Then the smaller resturants developed a water heatpump. Used to provide hot water for dishes and heat for the winter time. Back to my early writing, a low velocity system, if installed properly and sized correctly is better than any hi velocity unit on the market. If you tape ever joint and used duct mastic on all joints, seams, takeoffs and plenuims, you can reach less than a 5% ductloss. We found most duct leakage comes from the manufactors doors, conduit openings and drain openings. Just my 2 cents for the day.
I do love weatheat, but don't kick all of us scorch heat folks to much:)

Peace Be With You

David C. Broome
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