"...room temperature for optimum effect..."

Engines are VERY hard to turn over for starting after a night setting out in the cold in the wintertime in Anchorage...

The room temperature may not have any meaning insofar as the battery alone is concerned at all. For "optimum" jump starting I would want the engine "warm" and the battery "cold", so room temperature seems to be a reasonable "optimal, in the middle, optimal point.

And, if the battery were to perform best at 140F why waste fuel running the A/C to cool it? Anyone know at which point, hybrid battery temperature, the A/C begins cooling the hybrid battery?