Human beings are warm-blooded creatures, and so are most mammals and birds.
This means nature has gifted us several means to maintain a constant internal temperature — around 98.6°F.
These means include shivering, sweating, panting, etc., to increase or decrease the temperature when required.
Warm-blooded creatures can be as active in winter as summer — just that they need to optimise resources differently (e.g., eat and burn more food in winters).
The cold-blooded creatures don’t have the means to regulate the temperature.
So, they rely on external means to maintain temperature.
E.g. reptiles maintain the temperature by changing the environment — they lie down in the sun when they need heat and take a dip in the water when they want to cool off.
And cold-blooded creatures become inactive when the temperatures drop.
Mosquitoes are cold-blooded, and the drop in temperature because of the AC is one of the reasons why they don’t bite in AC.
Mosquitoes need a temperature of around 80°F (26.6°C) to be at their best performance.
Any temperature below 50°F (10°C) will kill mosquitoes, while 65-70°F repels and keeps them from disturbing you.
Also, mosquitoes find their targets by detecting body heat and carbon dioxide.
AC reduces our body temperature, and the AC breeze interferes with the carbon dioxide we exhale, making it difficult for the mosquitoes to find us.
The breeze also means mosquitoes cannot maintain balance while flying, making their job even trickier.
