Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Components (hierarchy name)
4. components (objects parts)
5. [components by specific context]
6. system components
7. HVAC components
8. [cooling, heating and humidifying components]

Anotations

Scope note:

Panels equipped with solar cells, designed to absorb the sun's rays for the express purpose of generating heat. For devices used to harness the sun's rays for the express purpose of generating electricity, use "solar panels."