Mark writes from Dallas: "I live in a 1925 house that has NO insulation in the walls. Removing the drywall on the inside of the house or removing the old wood siding on the outside is NOT something I want to do. Thus, standard new construction insulation is not for me. What other alternatives do I have? Do you have a product where I can drill small holes from the outside and fill in the existing wall cavity?"

Unfortunately, adding blown-in insulation to existing walls is not a good do-it-yourself project. The work could damage interior walls if not done properly. You state that your home has NO insulation in the walls but if there is even a small amount the existing insulation will likely block the new material from getting everywhere it needs to be. Also, I am not aware of any rental equipment for blowing insulation into existing walls. Bottom line: I recommend that you contact a local insulation professional. Thanks for asking. Pink Panther