Some electrotechnical products are needed to be tested if they can resist high and low temperature alternating at certain humidity before they are sold. It is one kind of environmental test. Then a High and Low Temperature Alternating Damp Heat Test Equipment, which is a kind of climate chamber or environmental chamber, is needed.The cooling, low temperatures, constant temperatures and humid temperature of the products give you the necessary cooling capability. Based on the distinct test claims of the products, the refrigeration method will automatically learn to supply cooling capability for the related test method, to be able to match the functionality crawl of the products.