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;.
Water leaks in central air conditioners are almost always caused by a problem with the condensate pan or drain pipes. The most common of those problems is a clogged drain line. When your condensate drain line gets clogged, water backs up and builds up in your pan. With nowhere to go, that water will begin to leak over your drain pan and onto your system and your floor. Another problem that can lead to a water leak is a crack somewhere in the pan or in the drain pipes.
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.