Our Certifications Our team at Campbell's Tempracure in Crystal Lake works hard to have the most comprehensive heating and cooling service around. One way we maintain 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. Dave Lennox Premier Dealer™ Dave Lennox Premier Dealers™ are specially trained and independently evaluated continuously to offer a higher level of customer service. As a Dave Lennox Premier Dealer™, our team in Crystal Lake has partnered with Lennox®, a top name in home comfort, to offer some of the most innovative and energy efficient heating and cooling products in the industry. To keep “Premier” status, Campbell's Tempracure participates in an independent Customer Review program that encourages our clients to honestly rate our performance so we can make sure our staff continuously is meeting or exceeding the highest standards for quality service. Better Business Bureau Campbell's Tempracure is a member of the Better Business Bureau. That means we abide by ethical business behaviors and give trustworthy information to our customers. We have a solid rating and are proud to be part of this organization.