You will hear about Pacific Northwest National Laboratory's (PNNL) Retrocommissioning Sensor Suitcase that will allow for small commercial buildings to realize energy savings in an easy, cost-effective manner. The RCx Sensor Suitcase is a novel hardware and software solution that addresses a relatively untapped commercial market that will simultaneously serve as a start point for greater energy efficiency. Preliminary field test outcomes and description of the prototype technology will be presented.