Novair Plus units are extremely efficient. The average utility bill with a mini-split system is approximately $600 a year. During the coldest winter months utility costs associated with heating a home using a heat pump/mini-split system can be as high as $120, relatively low considering our harsh winter conditions. During warm summer months air conditioning costs average $1 a day using one unit. These combined savings are able to provide a return on your investment within 2 to 3 years.