When a bedroom has supply vents but no return air path, closing the door creates positive pressure that pushes back against your AC system. This invisible problem causes uneven temperatures, wasted energy, and humidity issues—while conditioned air escapes through building leaks and outside air infiltrates from unconditioned spaces.

In this video, we break down exactly what causes room pressurization, how to measure it with a 3D visualization, and the solutions that actually work:

• Transfer grills and jumper ducts
• Door undercutting techniques
• Return air path design

Pressure testing with precision instruments

Using a DG-8 Digital Pressure Gauge and Roomulator™ Measurement Card from The Energy Conservatory, we show you how to test pressure differentials and bring imbalanced rooms back to the target of 3 pascals or less. This isn’t just comfort—it’s a code requirement in many jurisdictions.

Discover how proper home pressurization keeps your systems running efficiently, prevents moisture problems, and protects building integrity. This 3D animated guide makes a complex concept crystal clear for every technician.