How do I remove foam insulation from my wall?

Question

I just bought an AC to install into my wall but their is foam insulation there. What do I use to cut it out?

Answer 1

I would dig out the foam FIRST, to make sure that there were no pipes or electrical lines buried in it. Beyond that i would use a reciprocating saw instead of circular saw. Running a circular saw at a 90 degree angle is just begging for trouble. The right across your arm or leg kind of trouble. Use a reciprocating saw. Trust me.

Answer 2

Almost any saw will cut it. Poke a handsaw through it and start cutting sideways. Cut the outline with a circular saw set for a shallow cut or deep.