Sean Johnson


Sean's extensive industry knowledge combined with his drive and communication skills make him invaluable to Sub Zero and our clients. Sean lives in Brandon, SD with his wife, Samia, and twin daughters, Kaya and Mia.

Sierra Lambers

Office Manager

Sierra's sharp mind and attention to detail are essential to the day-to-day running of our business. Sierra is a native of Hartford, SD and lives with her partner, Carl. During their spare time, they volunteer at local animal shelters and are passionate about animals.

Liam Olson

HVAC Specialist

Liam brings 20 years of experience and expertize to Sub Zero. Hard working and conscientious, Liam is a master of his craft and a blessing to our company. Originally from Chicago, he moved to South Dakota in 2012 with his wife, Sandy.

Tristan McKenna

HVAC Specialist

Tristan graduated from Southeast Tech in 2015 and has been with us ever since. He is highly knowledgeable and passionate about his craft, making him an asset to Sub Zero and our clients. Tristan lives in Sioux Falls with his wife, Jade and their newborn son, Ryan.