We have a somewhat unusual split level home that was built in 1968 that has three separate attic spaces. There was very little insulation left and many penetrations into the house. The upper level was unbearable in the summer and we imagined it would be very cold in the winter. We chose Green Attic because we felt they were more meticulous than other companies, providing the most detailed quote and explaining all aspects of air sealing and use of cellulose insulation. For anyone looking to insulate, please note that air sealing is just as important - you will not get much benefit from insulation if conditioned air from your home can be exchanged with your attic! Unfortunately, after the job started, they did find mold, but the extra cost to remediate was certainly worth it. After the job was completed, we were not surprised the temperature of the house improved, but what we were surprised at was the significant improvement in indoor air quality. Just see the attached before and after as an example of how bad our attic was vs. how good it now is.