What type of electrical current do most A/C systems operate on?

Most A/C systems operate on alternating current (AC) because this type of electrical current is standard for residential and commercial power distribution. AC is used because it is more efficient for transmitting electricity over long distances and can be easily transformed to different voltage levels, which makes it suitable for a range of applications, including air conditioning units. Additionally, A/C systems, including compressors and fans, are designed to run on the alternating current supplied from the electrical grid. This compatibility with the electrical infrastructure is key for the functioning of HVAC equipment.

While there are specialty applications for direct current, such as in certain low-voltage systems or specific components, the predominant and standard use of AC simplifies the integration of A/C units into existing power systems, making it the prevalent choice in most installations.