You are way beyond your abilities Grasshopper. You have several choices....

2 window shakers

A 2 cassette mini-split

A couple of years in school or vo-tech to design and install your own system

talk to a local HVAC tech

Before trying to use your existing unit, you need to know the capacity(btu) volume of airflow(cfm), fan curve charts, static pressures(design and measured), actual heat load(btu), current and desired RH, current and desired temperature, and a whole bunch of other stuff if you want to do it right.