Common causes for this symptom.
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Door gasket compressed or cracked.
The rubber seal around the door has been crushed flat or split, breaking the air-tight seal.
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Mullion failure.
The vertical strip between French doors that seals the gap has bent, or the heater inside it has failed.
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Door alignment off.
The door has dropped or shifted on its hinges, breaking the seal at the top or bottom.
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Hinge spring weak.
The hinge no longer pulls the door fully closed when nudged — the door drifts open and warm air enters.
What to expect when we arrive.
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Marked van, uniformed tech, ID badge.
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Drop cloth and shoe covers before we step inside.
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Diagnosis and fixed quote in writing — before any work starts.
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Genuine OEM parts on every job.