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Air infiltration undermines comfort, energy efficiency, and moisture control. Building Enclosure Commissioning (BECx) applies QA/QC to the envelope: detail reviews ensure continuity of air, water, thermal, and vapor control layers; mock-ups validate tricky transitions; whole-building blower-door testing quantifies leakage; and infrared thermography pinpoints discontinuities. Findings guide targeted remediation—sealant continuity, membrane tie-ins, thermal break improvements—followed by retesting to verify gains. Upsizing HVAC treats symptoms, raises capital and operating cost, and still leaves drafts and condensation risks. Space heaters mask discomfort but increase energy use and safety concerns. Ignoring leakage sacrifices peak load control and often causes humidity problems. BECx reduces loads, stabilizes interior conditions, enables right-sized HVAC, and supports energy modeling assumptions—improving both certification outcomes and real-world performance.