HVAC sizing still has a long way to go. There’s a wide gap between contractors who skip load calculations entirely and those who fine-tune them. The biggest problem sits in the middle: Manual J reports with padded internal loads, degraded insulation inputs, and oversized systems justified by fear. And the idea that a two-stage or communicating system can “absorb” oversizing only makes the problem worse. Good results still depend on accurate inputs and disciplined design. Latest Flow Lab episode
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