CK5
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BTU output of stock heater system?

Not sure I've ever seen those specs, but from what I've experienced, it's which option the truck has as to how effective the heater feels.

If you've got a non-AC truck without the HD heater option, it sucks. AC and HD move what feels like twice as much air, and IMO is a requirement if the temperature gets into the 40's. (Fahrenheit) The non-AC setup could be 100,000 BTU's, but the fan isn't enough for the large cab. Your feet would cook but that's all.
 
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