GNI did a very clean efficient job in our complex. They insulated all the attics, no one complained and they cleaned up after the job. We will know better as a/c season approaches and than again in winter when we get our heating bill. Don't know the cost
- Company Response
Thank you so much for taking the time to review us! We hope you've already started noticing a difference in the temperature of you home. Thank you for choosing Great Northern Insulation!