Long term Temperatures below 15°C/59°F can cause
Dampness
Risk of colds and respiratory illness

Long term Temperatures above 25°C/77°F can cause
Risk of electrical items overheating
Sleep deprevation

Humidity below 35% can cause
Dry, itchy skin and hair
Risk of colds and respiratory illness

Humidity above 80% can cause
Irritable feelings
Sleep deprevation