How Freon Really Works: Proper Charging Explained In today’s HVAC breakdown, we explain how Freon works, how to properly check charge levels, and why temperature, pressure, and stabilization time all matter for accurate readings. We walk through: How heat is absorbed by the refrigerant line Why the suction line temperature should sit around 40°F, depending on pressure The relationship between actual line temperature vs. saturation temperature Why Freon needs time (5–15 minutes) to stabilize befo