I think the only thing a second element would do is heat the chemicals quicker so they would perk sooner. After the chems start perking and making their way throughout the circuit nothing more can be accomplished. The chems remove the heat from the interior so making the chems hotter or travel faster won't increase the cool down time, might even impede the cooling process itself.
2013 Voltage 3800, 2012 Chevy 3500 HD
2010 Yamaha V Star 950
2009 Yamaha Raider
Volunteering with Habitat for Humanity Caravanners