Ductless systems have been popular in Europe and much of Asia for many years, and they’re gaining popularity in the U.S. market. However, there are still some out there who believe ductless systems can be used for cooling-only applications. Or, they should only be used in retrofit situations where it’s not possible to install ductwork.
But the world of ductless is being shaken up. Sanyo’s recently introduced “Eco Multi” ductless heat pump system makes it possible to connect a series of multiple indoor evaporator units to one outdoor condensing unit. It is possible to install up to eight 12,000-Btu indoor units to each 72,000-Btu condensing unit. This is possible because the system is rated for up to 135% of the outdoor condensing unit’s maximum capacity.
The system provides true zoning capability because it offers the ability to run the indoor units at part-load conditions. Theoretically, that means less energy will be wasted; each of the indoor units will run only long enough to satisfy the demand.