Ductless Mini Split Sizing Guide: Heat Load & BTU Calculator A ductless mini split system is an ideal way to heat and cool several areas of your home in one convenient and energy-efficient package. However, the system is only as good as the size — too big and you risk wasting power and utility bills; too small and it might not do the job sufficiently. […] Read More of "Ductless Mini Split Sizing Guide: Heat Load & BTU Calculator"