Air conditioners are designed to perform at their highest efficiency even during the hottest summers—given that they’re properly maintained, that is. If not, it would be like if you were forced to go run a marathon while recovering from an injury!
If your air conditioner is suffering from a repair issue or hasn’t had maintenance in years, it could very well suffer performance issues from intense heat.
However, there are other times when the weather can affect the system, in both summer and in winter. Here are a few examples: