A lot of good advice here, most of which I agree with. I would be very cautious about running either of the A/C units when plugged (with an adapter) into a standard household outlet. Low voltage/amperage on the power source can damage the A/C compressor.
As mentioned, your best option is to have an electrician install a RV 50amp outlet in your garage, or wherever you can reach with the Precept power cord. Hopefully it can reach somewhere near the house's circuit box as this will be much easier and cheaper. Make sure it is an RV 50amp outlet. Don't plug into a dryer outlet. There are lots of videos on YouTube about how to test for a properly wired 50amp RV outlet.
Or, as mentioned, if this is just for occasional use, just run the generator. It will power both A/C units and most other accessories at the same time.
Have fun and stay cool.