Gastly are said to lower temperatures with their presence, but it’s the other way around — they are blown around by drafts, and seek out cold air to solidify them and help speed up their evolution into Haunter.

Wind can dissipate Haunter’s newly-grown hands, so it prefers its long prehensile tongue unless the air is still. HVAC systems should be checked regularly in the summer to catch Haunter infestations early.

Gengar home intrusions are common on cold moonless nights. Recent relieving research suggests they are energized by heat, so offerings of plugged-in electric blankets have become common near cemeteries.