attic temp in retrofit with spray foam
We recently converted our attic to an unvented attic with spray foam insulation on the roof deck. We live in a hot humid climate and our hvac system was in the attic space. Our attic temperature is averaging about 12 degrees higher than the temperature inside our home. We have friends who built a new home and used spray foam and their temp difference is no more than 5 degrees. About 75% of our attic space was floored so we did not remove the cellulose insulation in that area but we did remove the cellulose where the attic was not floored. Though our energy bill has decreased we have not seen the savings we thought we would. Is 12 degree difference typical for a retrofit? Should we remove all the cellulose to get a cooler temp in the attic? We did install an ac duct into the attic space as we were oversized on one of the units. Any advice would be greatly appreciated.