Human goal
Heat & cool buildings
How does a heat pump work — and what does a shop need to support comfort?
HVAC/refrigeration are S4 when refrigerants are involved. Cite ASHRAE/EPA; do not copy standards.
Lifelines: Food/Shelter · Health
Technologies
- INCOMPLETE — no technology cards wired yet.
Machines
- Heat Exchanger — MATURE_PROCESS_NO_MODERN_OPEN_IMPLEMENTATION