Our Certifications at Boyles Mechanical LLC Our team at Boyles Mechanical LLC in Marietta aims to offer the most comprehensive heating and cooling service around. One of the ways we sustain our expertise and continue to expand our knowledge of HVAC products is by earning industry certifications. Discover more about the certifications our professionals have received below. Better Business Bureau Boyles Mechanical LLC is a member of the Better Business Bureau. That means we operate by ethical business behaviors and share trustworthy information with our customers. We have a strong rating and are proud to be part of this organization.