Our house a 2 1/2 story (all roof except first floor), built in the late 1800s. Each summer, heat got trapped in the roof and attic, making the upper floors impossible to cool down even with two constantly running whole house a/c units. I called several insulation companies last winter and Koala was by far the most responsive. Koala added a significant amount of new insulation to the attic floor (stopping the conditioned air from being pulled into it), a very strong solar powered attic roof vent with a thermostat, and also insulated our attic access panel. We were able to tell the difference this year as soon as the outdoor temp started to rise. Today it's 90 degrees outside and the 2nd floor - where we sleep - is at least 5 degrees cooler than it was last summer with the same outdoor temperature. The Koala sales rep was informative without being pushy or trying to oversell, the installers showed up on time and were both hard working and friendly, and the price was very fair. We even qualify for a federal tax credit! Although I haven't yet received a summer electric bill, I think we'll recover the cost fairly quickly. Even without any utility savings, it was well worth the price. Highly recommend! read more