Antihistamines, H1. Histamine antagonists or antihistamines are drugs that relieve allergy symptoms.Histamine is a chemical used to identify and remove substances that trigger an allergic response. Ã¢ There are four histamine receptors &#40;designated H<sub>1</sub>, H<sub>2</sub>, H<sub>3</sub>, H<sub>4</sub>&#41;.
Quick Answer. Blocked condensation drain lines often cause excessive amounts of water in an air conditioner drain pan. These lines are designed to funnel excess water from condensation away from the air conditioning system inside the home. If these lines become blocked, the excess water drains into a drain pan.
This can be a nasty problem, and itâs definitely not something that you want to ignore. So today weâre going to talk about why your air conditioner might start to smell bad and what can be done to fix the problem! Possible reasons why your air conditioner smells bad. 1  Air conditioner is too big for your home. 2  Everyone knows that an air conditioner is used to cool your home, but many people donât realize that it also performs a second function: dehumidification.