For 2010, Multistack took all of the existing features and added microchannel heat exchangers that reduce the refrigerant charge by 35% to 40% to increase LEED contributions. And, thanks to the microchannel heat exchangers superior heat transfer characteristics a 20% air side pressure drop helps create a 6% increase in energy efficiency.
Finally, maintenance gets easier since high pressure water cleaning of the heat exchangers is possible.