Originally Posted by RustyFairmount
This is just a guess...so bear with me. Some AC units are actually heat pump types of units, capable of providing either cooling, or heat. Might it be possible that the other "low" setting" would be used for heat, if the model were so equipped?
I asked our dealer when we picked up our unit this weekend and this was the answer we got.
Apparently you can add a heat strip and use the second "Fan Low" for heat.