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.
How to Fix a Frozen Air Conditioner. To fix a frozen air conditioner, first you have to figure out what caused it to freeze up in the first place. No matter what, the first thing you should do if your air conditioner is frozen is turn it off and let it defrost â this will prevent any serious damage to the system. Next, check all the air filters in your home to see if they are dirty or blocked. If they are dirty, clean or replace them.