If the room temperature is too high, the indoor air will become dry, and people's nose and throat will be dry, congested, painful, and sometimes nosebleeds. At too high a temperature, people will also become irritable, inattentive, poor in accuracy and coordination, slow in reaction and so on. If the temperature difference between indoor and outdoor is too large, people are easy to catch a cold in the hot and cold environment. For the elderly and hypertensive patients, the indoor and outdoor temperature difference should not be too large. Because the indoor temperature is too high, human blood vessels dilate. At this time, if you go outdoors suddenly, the blood vessels will suddenly contract, which will hinder the cerebral blood circulation of the elderly and hypertensive patients and easily induce a stroke.
In addition, if the indoor temperature is too high, the amount of toxic gases released by furniture, stones and indoor decorations will also increase. In winter, most rooms have closed doors and windows, and harmful substances are more likely to accumulate indoors, which affects human health.
On the other hand, the heating temperature in winter should not be too low: when the temperature is lower than 12℃, 80% people sitting will feel cold, and 20% people who are active will feel cold, so hygiene takes 12℃ as the lower limit of building thermal environment. If the indoor temperature is too low, it will reduce the metabolic function of human body, slow down breathing, contract subcutaneous blood vessels, weaken the resistance of respiratory mucosa, and easily induce respiratory diseases such as colds. Moreover, due to the stimulation of cold on the body, the blood vessels of the human body will contract, the heart rate will increase, the workload of the heart will increase, and the oxygen consumption will increase. Severe myocardial ischemia and hypoxia can cause angina pectoris, so patients with coronary heart disease should pay special attention to heating in winter.