A household refrigerator/freezer (HRF) is a necessary appliance in our daily living. It operates and consumes energy all day long. The energy consumption of HRFs account for about 15–20% of total domestic electric usage. Recently, a novel design of HRFs is focused on energy saving, low noise, freshness preservation, instant freezing, and some multiple operation functions for customers. Using high efficiency of HRFs can reduce energy consumption and save domestic expenditure under proper operation. As the door of a HRF is opened, the moist and warm ambient air will intrude into the cabinets. This will cause the increase of the thermal load for a refrigeration system of HRF and the change of freshness of food. As a result, the HRF needs to provide an additional cooling capacity to make up this extra thermal load. Therefore, this paper studied the energy consumption issue of HRFs under some testing conditions with door opening, and also discuss the variation of compartment storage temperatures during door opening.