" Maybe someone needs to take another look at the door or the
mounting of
the openers. There just should not be that many failures. If the door
is
properly installed and a properly sized opener or any make properly
installed should be able to function. "

I agree. And has the door been checked out during cold weather, which
is apparently the problem? A garage door shouldn't be very different
in opening force in cold weather. It's possible something is shrinking
and binding. What kind of lubricant is on it?

With the opener disconnected, the door should move easily up and down
with one hand. At about the mid-point of travel, it should be just
about balanced so that it will stay there if you let it go.