Once again, an article that asks the WRONG question. It should have read, "How do I measure my wall receptacle and make sense of what I am seeing. Instead he makes a nonsensical assumption based on ignorance. Sorry if that stings a little but it is true.
As stated above only one of those holes in your socket is live and when tested against any of the other two it should read (in the USA) 110v or close to that. If your situation was actually speaking of 80 VOLTS then yo are running a severe UNDERVOLTAGE and this can be quite harmful to a lot of your devices especially motors in your Refer and AC units. Under voltage can actually be MORE harmful than overvoltage. CALL you Utility provider and have them test you supply. if that is satisfactory, then you must immediately find out WHAT in you home is causing this drain. It should NEVER get below 100V and even at that it should not sustain that for any length of time.