what is the maximun distance you can run an extension cord for a temporary air c

[Richard]

need to set up a temporary window a/c unit from an outlet 200 ft away what is the maximum distance I can use

[disqus_1UaB9KMYSv]

I don't think 200' is ever going to happen. The copper losses would be huge. Plus it would be prohibitively expensive. 200 feet of 6/3 with ground Romex is going to set you back $350 or $400, and even that would probably not be heavy enough for what you want to do.