ESCO Air Conditioning Practice Exam 2025 - Free AC Certification Practice Questions and Study Guide

During the summer, the recommended residential indoor relative humidity is generally between 40% and 50%. Option A (30%) may be too dry and lead to discomfort and respiratory issues, while option D (60%) may be too humid and create a breeding ground for mold and mildew. Option B (40%) is close to the recommended range, but option C (50%) is the ideal balance for both comfort and health. It is important to maintain this recommended range for optimal indoor air quality and to avoid potential health hazards from excessive moisture or dryness.