BTU is the abbreviation for British Thermal Units. One BTU is the energy required to heat (or cool) one pound of water, one degree Fahrenheit using a standard atmosphere. Older A/Cs used to be rated in tons of ice or the energy to convert a ton of water at 32.2 degrees Fahrenheit to a ton of ice at 32.2 degrees. One ton of cooling is roughly 12,000 btu. The ratings you quote are 15,000 btu for a Coleman Mach 15 @ 80 degrees outside temp or 13,500 btu for a Coleman Mach 3 @ 80 degrees.
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Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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