Brendan and Nicholas did a great job vacuuming my heat and air vents. They were very professional and arrived on time, explained what they were going to do and answered our questions. Both Brendan and Nicholas were courteous. After cleaning the HVAC system, we saw before and after pictures of the furnace system (which is located in a crawl space). This service was completed on a rental house in Port Huron, Michigan. A recommendation was made regarding the furnace filter. Both young men did a great job and my husband and I are very pleased. I’m glad I contacted Safety King!