Welcome! Here are some tips for using this forum.
I just spoke with someone at a local manufacturer and yes, this law applies to window and PTAC units as well.
It is okay to sell any existing stock, but no R-22 systems can be manufatured or brought into the country after January 1, 2010.
What's really funny is this. The company I spoke with has a facility abroad and they have to get all of the R-22 stock over here before January 1. Even though they own the facility, bringing the goods over after Janauary 1, 2010 would be a violation of the new law.
Hope this helps.