During extreme heat (45°C+), even properly sized ACs struggle because the temperature difference the compressor must overcome becomes too large for efficient operation.
Data Verified: 2026AC efficiency drops significantly above 43°C outdoor temperature. The compressor works harder to reject heat through the condenser, and many ACs have upper operating limits of 46–50°C. Above this, the compressor may cycle off for protection, causing intermittent cooling.
Practical solutions for heatwave cooling: set realistic temperature targets (24–26°C is achievable, 18°C may not be at 47°C outdoors), pre-cool the room in the morning before peak heat, block all direct sunlight, and use a fan to improve circulation.
Ensure the outdoor unit has shade and airflow. An outdoor unit in direct sunlight at 47°C is working at its thermal limit — partial shading of the outdoor unit (without blocking airflow) can meaningfully improve performance.
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Is it normal for AC to cool less during a heatwave?
Yes. AC efficiency drops in extreme heat because the compressor has to work much harder. Set realistic expectations — 24–26°C is achievable at 47°C outdoors, not 18°C.
Can a heatwave damage my AC?
If the outdoor temperature exceeds the AC's operating limit (usually 46–52°C depending on model), the compressor will cycle off for protection. This is a safety feature, not damage.
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