How to figure out what serial and model numbers represent on unit

hello,
I have the following units
heritage 12 American standard Tyler, Texas mod 6h2036a100a4 ser R302tgc1f
Trane mod bwd718a100b0 ser y47254842
how do break down what the units are in terms of tonnage and information, I have been all over the web and cannot find a cross reference of what the mod and serial numbers on a A/C unit represent. if this is the wrong group, any information where to post would be appreciated. thanks
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every manufacturer has their own codes
trane / american standard makes it harder than most others
it appears the a/s is a 3 ton made in 2000 and the trane is a 1.5 ton made in 1985
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-Canadian Cool
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The 1.5 ton might be a 1972
HAHA
-Canadian Cool
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