Patten CAT is a fourth-generation Caterpillar sales and service organization that began back in 1933. Their relationship with Cambridge Engineering heating products started in 2005 when they purchased their first Cambridge S-Series unit to retrofit a less than effective heating system at their Oglesby, IL location. Fast forward 12 years, and Patten has over 25 Cambridge units heating six of their locations throughout the Chicagoland area.

They include: