What’s the Expected Price for a Blown Insulation Project?

I’m trying to understand the expected price for blown insulation project upgrades because I want to improve my home’s energy efficiency before winter arrives. I’ve talked to a few contractors already, but the estimates vary a lot depending on attic size, insulation material, and whether old insulation needs to be removed first.

Some companies recommended blown-in fiberglass, while others suggested cellulose insulation for better coverage and performance. I’m also curious if adding air sealing or ventilation improvements makes a noticeable difference in overall comfort and energy savings.

For homeowners who recently completed a blown insulation project, what was your final cost, and did you notice lower heating and cooling bills afterward? I’d really appreciate hearing real experiences before making a final decision.