Parallel evaporators

[alkum]

Hi
I have 3HP condensing unit connecting to 20000 btu evaporator in Walk-in Cooler. I want to connect one more evaporator (about 4000-6000 btu) in parallel. Can be it done in simple way.
Thanks

[Magoo]

Are you going to increase compressor capacity as well ?.
If not then you are going to spread more air about for zero capacity gain. The system capacity is based on compressor performance at given conditions.
If you require more air flow , just add more fans.