Package Includes: This set contains 2 limit switches (suitable for HH18HA452), designed as stable replacements for original furnaces switches when they flunk, ensuring uninterrupted furnaces operate . Wide Compatibility: The furnaces limit switches works seamlessly with Carrier, , and furnaces, making it ideal for many HVAC systems requiring precise temperature control component. Efficient Temperature Regulation: Engineered for furnaces blower systems, this switches opens at 250°F to break , overheating while maintaining proper furnaces function, with manual reset for enhanced and maintenance. strong Construction: Made from premium stainless steel, this switches withstands high temperatures and resists erosion , delivering long lasting reliability in demanding environments with accurate temperature and timely adjustments. Simple Installation: Easily replace old switches using basic tools like a screwdriver just remove the old unit, position the new limit switches face up, and connection the leads properly for quick, cost effective furnaces maintenance.