Thanks advance to the community. I’ve gotten quotes from a cellulose guy and an injection foam guy to insulate our exterior walls. I already gutted the attic and insulated to r-60 (except on the cathedral ceilings r-30 was the best I could fit.) As for the existing walls both guys say their product is the best choice for my 1916 Southern Colonial. It's balloon framed and has aluminum siding (which we plan on replacing at some point). However, both contractors are proposing to do the work from the inside. Foam is about 2.5x higher in terms of cost - but he claims a 50% reduction in energy usage. Cellulose claims 25%. From a math standpoint - if the energy savings are true - the pay back is only a few years and we plan on staying in the house for a long time. But what concerns me is some of the horror stories I've read about both of these products. Many people claim that the effectiveness is nowhere near the savings claims. Some claim foam will blow plaster right off the walls. Others say cellulose gets wet from condensation and will cause mold. Not to mention settling of cellulose and cracking of foam. I don't know what or whom to believe. Wondering if i should just wait until we're ready to reside the home and handle the insulation issue then??? Hoping TOH Community can settle the matter for me and give me peace of mind that I'm making the right decision for my home. Please help!