text: Actually, both sentences would be correct.  I don't know the context.  \n\n"many" would refer to the the number of technologies being used.  "Much" refers to the amount they are being used.\n\nAnother way to say them:\n\nA:  Many people are not aware of the number of new technologies already being used in the home.\nB.  Many people are not aware of the ubiquitous presence of new technologies in the home. OR ..aware of just how much new technologies are being used...