We had carpenter bees that were drilling holes into window frames and other wood on our house. The Beekeepers came out and, per their recommendation, twice treated the affected areas. I thought I was going to have to have them back because of a few pesky returning bees, but sure enough they were all gone within a few weeks. I definitely would recommend this group. They were very nice, thorough and careful and answered all my questions. I would use them again.