We used Durham insulation to insulate our sun room (it was an addition to the house we purchased and it was never properly insulated). Durham insulation was to spray polyurethane spray foam on the floor and exterior walls and then come back later to blow loose cellulose insulation in the sun room attic.
They arrived as promised and did the spray foam insulation. They did not do a very good job on the spray foam insulation, my invoice states 5 inches on the floor and in some spots it is barely 3 inches, also they did not clean the floor joists or tape them as well as on the walls, so I had to clean it up so I could lay my sub-floor and drywall.
They told me they would come back the following Thursday to do the attic (Thursday at 8:30 am). I took the day off work and guess what, they did not show up. I called and spoke to Robert at 10:30 am and he said the guys would be there between 12 and 4:30 pm. No one showed up. At 4:30 pm I called Robert, and he did not answer my call and let it go to his voicemail. I left him a message. Robert then called back and said there was a mix up and the guys would be there on Friday. They showed up on Friday.
For the blown insulation, they did an ok job. Overall, not impressed.
Words of advice, if you use Durham Insulation, do not make the mistake we made by paying for the whole job up front. Only pay for what is done, you are not required to pay for the work upfront, by law you can hold back portion of the costs until the job is done. We have to say not impressed and we will not be recommending Durham Insulation nor will we ever use them again.