Stubby wrote:
My heat bills are about twice what neighbors pay in similar houses.
And, I get ice dams. So it seems there is heat leaking up into the
attic. I have soffit vents and a ridge vent. So I called 3 insulation
....
I'm hesitant to spend $1600 on additional insulation if it isn't going

Well, you're losing heat through the attic, so you need insulation
there. You should go up there (with dust mask, body all covered, etc.)
and check for great big holes into the living space. Once you take care
of that, you can do your own cellulose for less than $200 per 1000 sq
ft. Just don't cover up your vents.