This included refrigeration equipment such as refrigerators, air conditioners, and freezers. Voltage regulators are used in devices like air conditioners, refrigerators, televisions etc. Portable air conditioners are either evaporative or refrigerative. In 1965, it acquired Amana Refrigeration, Inc., a manufacturer of refrigerators and air conditioners. It can contaminate hot water tanks, hot tubs, and cooling towers of large air conditioners. The primary disadvantage of ductless air conditioners is their cost. High quality, middle-end air conditioners and refrigerators retail under this brand name. Almost all air conditioners and heat pumps in use today employ vapor-compression of refrigerants. Power electronics even appear in modern residential air conditioners. The Company offers two types of air conditioners&colon; household air conditioners and commercial air conditioners. The technology was also used in air conditioners and washing machines. They are also very cheap to install and use less energy than refrigerative air conditioners. These are used to cool homes and offices much less expensively than using air conditioners. It is commonly used in hair conditioners and other hair products. Rooftop air conditioners and new horns were added.