If you want my psak, the counters may be changed w/o treifing up first since you are moving into a a new house. Formica may be kashered. DON’T use an electric iron, it is an electrocution hazard. A red hot metal pipe is ideal to roll on the wet counter. DON’T do this yourself, bring someone who knows the Halachos and has lots of experience. And still I think you should ask your own Rav.
