by Mark Hansberger on December 3, 2013December 3, 2013 The Ductless Mini-Split: Making Major Strides Since the ’70s Ductless mini-split systems have come a long way in the 40 years since they became popular in Japan. They were originally introduced as an alternative to window units.Read More Filed Under: Ductless Mini Splits Tagged With: Arizona– BTU– energy savings– hansberger refrigeration– heat pump system– HVAC company– hvac systems– Yuma– zoning control– zoning systems