Like hazards, enemies instantly kill the Hot Air if contact is made. All enemies cannot be killed, and often are stationary. Each level of Hot Air 1 & 2 usually introduces a new enemy, Enemies from previous levels typically not being reused for other levels. Some enemies were reused for other levels of Hot Air 2, sometimes having minor changes to their behavior.
A few times in the Hot Air series, a variation of an enemy is introduced, having the same appearance to the original enemy and having their colour scheme redone. Enemies in the Hot Air series often are very big, only one appears, and have a special ability; they could also attack, or be interacted with.