The top horizontal member in a door or window frame. …
Header
A crossbeam above a window or door. …
Heat Anticipator
A component of a mechanical thermostat that shuts off the furnace or boiler just before the set temperature is reached to prevent overheating. …
Heat Pump
A heat pump is a climate control device that extracts heat from one source and transfers it to another location, serving both heating and cooling purposes. It operates on the principles of …