1. A method for detecting appliance in a building, comprising: receiving meter data associated with energy consumption, the meter data comprising at least energy consumption data associated with usage of the appliance; receiving customer data associated with the meter data; extracting features, by a processor, for training a model for detecting the appliance, based on at least the meter data and the customer data; constructing, by the processor, the model at least based on the features; and applying the model to candidate meter data associated with a candidate customer, for detecting whether the candidate customer is using the appliance.