Experiencing a bedroom or living space that gets significantly hotter than the rest of your house is typically caused by a combination of high solar heat gain, structural layout factors, and restricted HVAC airflow. Rooms with large west-facing windows, insufficient attic insulation underneath sun-baked roof decking, or located directly above a hot garage absorb massive amounts of thermal energy that standard heating and cooling cycles cannot counteract. Additionally, if the branch duct supplying that room is undersized, crushed in the attic, or choked by a closed balancing damper, the space will be starved of the chilled air required to offset that intense heat load. You can troubleshoot by inspecting insulation and vent output. You can verify that your cooling strategy is working when adding window films, upgrading insulation, and opening dampers successfully equalizes room temperatures.
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