Aleph America PS-2023 Commercial Overhead Door Contact Sensor - Heavy Duty Security Alarm System for Warehouse, Garage & Industrial Doors

I want to heat my garage this winter, but my kids keep leaving the door open when they are outside, so I used to end up heating the outside. I needed a fix for that situation, so I used these proximity switches to shut off my garage furnace when either garage door is opened. They were easy to install and the instructions made it clear how to do so. The included bracket and hardware made it easy to have options on how to install the magnet. I ended up with about an inch between the magnet and switch at close which is more than close enough to activate the switch. The switches are in a Closed position when the magnet is near and opens when the magnet moves away. I used this to create a loop circuit with my thermostat, and it works like a champ. Now I can keep my garage heated and not worry if my kids forget to close the garage as the furnace won't run with the door open.