Isn't May the hottest month of the year ? Or is it July ? Ventilation is often talked about as a GOOD THING to have. The mechanism of the virus multiplying requires a "live" cell, and dead cells cannot do that. You are safe from Chicken and Fish from across the arterial road. If you can afford to keep the sliding window open (AC on or off?) go ahead and help yourself with some "fresh" air. You would be blessed with only the regular purity of the usual air.