Im looking for a way to change the house frequency of 50/60hz into terahertz. Been looking at oscillators, generator and not being able to get high enough in frequency.

So does anyone know a direction I should be looking?

You need to be more specific. You say you want to change "the house frequency" - do you mean you want to change your 220/110 volt lines from 60Hz to 1 THz? Or do you mean your looking for a signal generator that can generate a signal in that range? If the former - the obvious question I have to ask is... why? Even if this was possible, your house wiring can't handle such frequencies, so you wouldn't have terahertz currents at the outlets. Again, if you can give a bit more detail of what you're trying to accomplish we may be abke to help.