Fix a Room That Never Gets Enough Air
A west-facing bedroom that stays hot: its load, the airflow it needs, why a 6 in. branch cannot deliver it, and what to change first.
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Heating and cooling guides
Sizing replacement equipment from the house rather than the old unit, fixing the room at the end of the duct run, and planning fresh air for a tight house without wasting heat.
Plan Fresh-Air Ventilation for a Tight House
ASHRAE 62.2 for a 2,400 ft² four-bedroom house, what that air costs to heat through a winter, and when an ERV or HRV pays for itself.
Read guideSize Replacement Heating and Cooling from the House, Not the Old Unit
A 1,600 ft² house with an 80,000 BTU/h furnace and a 20,300 BTU/h heat loss: the full load calculation, the airflow check and whether the high-SEER2 upgrade pays.
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