You seem to imply that since the companion unit has a 30 amp outlet, that it puts out 30 amps by itself? not true
The Honda 2000i and 2000i companion are exactly the same output, its only the plug configuration that differs. The 30amp outlet that comes built into the companion is only good for 30amps when two 2000i units are connected together with a parallel cable kit..
You can accomplish the same by connecting two 2000i regular units together using an external parallel cable & 30 amp connector accessory kit. Just depends what you want to plug into them, in some cases having more of the 20amp duplex outlets is more useful than having the 30amp builtin with less 20 amp duplexes. But in either option, the rated output is exactly the same for either style unit 2000/1600W for a 2000i regular or a 2000i companion, or 2 units together gives you 4000/3200W. 16.7 amps max (short term) - 13.3 amp continuous, per unit.
Most AC units will require at least a 3000 or 2 parallel 2000 units. Although you can run some small room size AC units off a
single 2000i gen with no other loads. It all comes down to knowing the starting & running loads for the devices you want to
power with the genny.