On the Build Show, the Jake Bruton sits down with mechanical engineer Ross Trethewey to walk through the HVAC plans for a high-end custom home. Ross explains why design should come before installation, starting with client expectations and a Manual J load calculation, then moving to equipment selection and duct design. They review the plan set sheet by sheet: zoning and controls, color-coded equipment layouts, register tags with airflow and free-area specs, terminations, schedules, and installation details. Along the way, they discuss air leakage, window performance, and how a register’s free area affects airflow, balancing, and noise. They also cover why a uniform thermostat setup keeps things simple for homeowners.

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