Dear Energy Modelers,

I am modelling a 40,000 ft2 open space warehouses, conditioned by four rooftop units, along with eight infrared heaters for extra heating during winter. I have divided the space into 15ft perimeter zone and one big center core zone. Given all the rooftop units are identical and all the infrared heaters are identical. Would it be correct if I add up capacities of the 4 rooftop units and combine them into 1 heating system, since they all have same efficiency? 

Thanks,

Jesse