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 is a job for your HVAC specialist. Incorrectly Installed A/C Unit â If your unit is not level or if thereâs too much proessure, this could cause the valves to leak and water to pool. Blocked Drain Hole â One of the most common (and least costly) causes of a leaking air conditioner is a blocked drain hole.