Bruce,
Most places will give you names of installers. I have found that the prices
from window and door stores compare with that of the big home stores. I had
double storm doors installed in September and the place i got them from (The
Door Store) came to within a few dollars of Menards. The doors were cheaper but
the installtion was higher and it was almost a wash.I can also tell you that
Larson doors are very good.