Most fatal fires occur at home. That is the alarming statistic that compels safety advocates to urge everyone to have working smoke detectors at home.
For optimal protection, you may want to add a heat detector. It is a temperature sensor that works by detecting a rapid rise in heat, or by registering a significant increase in indoor temperature.
Some heat detectors use a combination of both technologies.
Heat detectors should never replace smoke detectors, which alert you to the earliest sign of fire. But they certainly can enhance the system you have. They work best in areas of your home that smoke detectors cannot reach, or rooms where the temperature tends to remain constant.