[Zeke]

Won't work to divide the existing circuit. No can do. What you are essentially doing is supplying one receptacle for 2 cords and swapping them back and forth.. (You wouldn't wire a condenser with a service cord.) Run both at the same time and it will overload the breaker. Change the breaker size and change the wirze size accordingly.

With all due respect, hire an electrician, even if he just hooks up the final bits. Crawling is tough so find a small energetic person to pull the cable. No reason to pay jourman's wages for that.

Condenser is the whole unit that has a compressor, coils and a fan.