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.
Leaks from your AC unit's condensation line can sometimes cause costly hidden water damage, Zemach says. (Photo courtesy of Angie's List member Richard B. of San Diego) Condensation from an air conditioning line leak could be causing damage to your home - learn how to prevent the problem before it starts. Water damage resulting from an air conditioning condensation line leaks is more common than you might think. Condensation line leaks can be very devastating as they usually go unnoticed, mostly because they are inside walls and located in low traffic areas.