having some panel meters help me to manage our current drawl - i can run one unit on a 20A circuit (think in front of my MIL's on the curb)....during the day if its not too hot (90 or less) we'll run the front AC w/ the bathroom door shut or open (depending on how hot it is).
at night we'll switch over to the rear a/c unit (only) and shut the bathroom door to trap the cool air in the bedroom.
I can and often do run both units on a GOOD/Solid 30A circuit - managing the consumption by shutting down an a/c unit to run other appliances (if necessary).
my panel meters were only $10 each & they use inductive (donuts) like a clampmeter to measure the current drawl on each of my 2 (50A) legs. In the picture below you can see the 10A drawl of the front AC unit (leg #1).
