Our Certifications Our team at Falls Mechanical Services LLC in Great Falls strives to provide the best heating and cooling service around. The primary way we sustain our expertise and continue to learn about HVAC products is by earning industry certifications. Learn more about the certifications our experts 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 Great Falls has partnered with Lennox®, a top name in home comfort, to provide some of the most innovative and energy efficient heating and cooling products in the industry. To keep “Premier” status, Falls Mechanical Services LLC is involved 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.