Windows are not made equal, read an old Consumers Reports article
testing 20+ windows. I had Pellas and Anderson installed the Pellas
condense the Andersons dont. Look At CDF Condensing factor ratings, Also
most major companies allow a 1/8th" maximum for plumb , level and
square, be sure to verify before you pay because if you are 1/8th" or
more out you have no warranty from day1.