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 - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
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