This depends greatly on two factors: 1) How long the power was interrupted and 2) whether you opened the refrigerator or freezer doors after your power was lost. Most refrigerators and freezers not opened after a loss of power will maintain temperature for quite some time. Refrigeration units can usually maintain a safe temperature for 8-12 hours; while freezers, if kept closed, can maintain a safe temperature for 24-48 hours. If the refrigeration or freezer units have been opened, much of the temperature holding capacity has been lost. If your power is interrupted for more than four hours, the rule of "When in doubt, throw it out" applies to foods in your refrigerator. The foods in the freezer may be used if not completely thawed for more than four hours.

Check the unit and batteries for proper functioning. If they appear to be working properly, contact the fire department immediately. Carbon monoxide is a tasteless, odorless gas. Over exposure can result in death. It is a good idea to have the Health Department check the carbon monoxide levels in your home, even when there is no obvious problem. A good time for this test is the beginning of each heating season.