Final answer:
Improper attic ventilation can lead to moisture problems, insulation failure, and create an environment for animal habitation. It does not contribute to reduced energy consumption, but rather can increase it if the insulation is compromised.
Step-by-step explanation:
Improper attic ventilation can cause a variety of issues in a house, such as moisture problems. These issues arise because adequate ventilation is necessary to control the humidity levels within the attic. If the attic is not properly ventilated, moisture can build up, leading to the growth of mold and other moisture-related problems. Furthermore, insulation can fail if moisture degrades its properties, reducing its effectiveness. This can then lead to increased heating and cooling costs rather than reducing them. It can also create a conducive environment for animal habitation. While adequate attic insulation can help to reduce energy consumption, improper ventilation works against this benefit, potentially leading to higher energy costs and related issues.