If you mix heat and cold in a freezer, the result will depend on the specific temperatures involved and the materials being subjected to these temperatures. However, in general, introducing heat into a freezer will cause the freezer to work harder to maintain its cold temperature.
When you place something hot inside a freezer, such as a warm dish or a container of hot water, the heat energy from the hot item will be transferred to the surrounding colder air inside the freezer. This will cause the air temperature inside the freezer to increase temporarily.
As a result, the freezer's cooling system will detect the rise in temperature and activate to bring the temperature back down. The compressor in the freezer will run for a longer period of time to remove the heat and restore the desired cold temperature. This can lead to increased energy consumption and a longer cooling cycle for the freezer.
Additionally, if you put a hot item in the freezer, it can affect the other items already stored inside. The heat from the hot item may cause the surrounding items to warm up slightly, but this effect is typically minimal and short-lived in a well-insulated freezer.
It's worth noting that introducing extremely hot items into a freezer can have some adverse effects. Rapidly cooling certain materials, such as glass or ceramic, can potentially cause them to crack or shatter due to thermal stress. Therefore, it's generally recommended to allow hot items to cool down to room temperature before placing them in the freezer.
In summary, mixing heat and cold in a freezer will cause the freezer to work harder to maintain its cold temperature, resulting in increased energy consumption and potentially affecting the other items stored inside.