My hearty congratulations on a job well done! And I will rejoice with you when you receive your first (lower) heating bill.
Now for your next project, can I make a suggestion?
Add an extra layer of sheet rock to the inside walls of your house.
It not only increases the insulation properties of the home, but it also increases the soundproofing abilities, as well.
I have that on my house, and the resulting quiet is nice indeed.
It's also something that can be done as a long time project, room by room.