There is a formula for calculating heat loss in a building, however you need the R value of your walls and ceiling. I doubt if plastic will provide an R rating of 1. If it did, you will need 66,800 BTU's/hour to bring the temp from 10 to 50. It is always nicer to have too much horsepower when it comes to a furnace than too little. This does not factor in air leaks or raising the temp of the floor. Trapped air is an insulator. If you used 2 layers of plastic with as much air space between them as possible, it should take less heat. However, plastic can catch on fire, be careful. Try it and let us know how it works out.
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Today's Featured Article - History of the Nuffield Tractor: Conclusion - by Anthony West. In the last piece I mentioned that Nuffield had reached the stage where they had chosen to drop the "Universal" from production. The two new models were given three figure numbers, instead of "three" and "four". Model numbers were introduced to help farmers and dealers instantly recognize the engine size and horsepower of the tractor, the 4/60 had a four cylinder diesel engine which developed 60 bhp at 2,000 rpm. The 3/42 had a 3 cylinder diesel engine which produced 42 bhp at 2,000 rpm. Th
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