On 4/10/18 9:18 AM, Ed Pawlowski wrote:
After 100 years you'd think someone would be smart enough to
insulate. You boiler will run much less once you do and it
will pay for itself quickly, plus add comfort.Â* Less run
time, little temperature swing.

Can't install insulation (at least the "blown in" kind).
I also have original knob-and-tube wiring, and I believe
that the recommendation is that blown-in insulation SHOULD
NOT be used with K&T.

There is insulation in the attic -- directly under the shingles!