Safety King was at my son’s Historic home on 11/09/15 they were at his home close to 4 hrs. Peter and Chad arrived on time which I liked. They took their time cleaning out all air ducts which had not been cleaned since the house was built in the 1920’s I’m sure. Chad cleaned the ducts inside the home while Peter worked on the ducts in the basement. Both Peter and Chad were very friendly and polite. Any questions we had they answered and made some suggestions. Before and after photos were sent to me today. I was amazed at the dust and debris in the duct UGH. You never know what you are breathing into your body. I am very pleased that we used Safety King it was expensive but totally worth it. I would use them again in the future. My son said the air quality is much better.