Heat Detector for Garage Installation Best PracticesGarage heat detector installation is within reach of most people who are comfortable with basic DIY. Interconnected Heat Alarm ConsiderationsAn interconnected heat alarm setup means that when one detector triggers, every alarm in the system sounds simultaneously. Testing and Maintaining a Heat Detector for GaragePeople buy a heat detector for use in the garage, install it, and then forget it exists for years. Installing a heat detector for a garage takes less than an hour with a battery-powered unit, and a quality heat detector for garage use costs far less than most people assume. A garage heat detector installation that includes wireless or hardwired interconnection means the alarm sounds throughout the house the moment the garage device triggers.