Residential HVAC Installation Practice Exam 2026 - Free HVAC Practice Questions and Study Guide

Moisture in a liquid state must be evaporated before it can be removed with a vacuum pump. This process occurs when a liquid changes to a gas or vapor state, typically due to an increase in temperature. Filtering, boiling, and crystallizing are all different forms of separation or purification that would not result in the complete change of liquid to gas needed for removal with a vacuum pump. Therefore, these options are incorrect.