Concrete with embedded thermal mass, buildings as heat sinks, roads that absorb and re-radiate, ground source heat pumps, water pipes as thermal buffers...
This is the single most expensive misconception in electronics. A board can: power up, pass a bench test, even ship …and still be fundamentally unstable.
Soldering is part art, part science. You do not "plug" parts into the board and expect it to work... Each joint must be clean, conductive and mechanically sound