Consider the impact of an M&V program on mechanical system design and space requirements. Keep in mind that your mechanical system must be capable of providing the necessary outputs for continuous metering. (The outputs are typically energy usage as kWs, BTUs or therms over a given period of time.) Whether an automated record from a BMS or a metered reading taken manually on a continual basis, the specifics of output metric and duration must be defined in your M&V plan.