Question: are split systems expensive to run?
Answer: Split System Costs The proof of that energy efficiency lies in the power bill pudding. Split systems typically use about 9,000 BTU or 900 watts. Running for eight hours per day at the national average kWh unit cost of 13.2 cents, a ductless mini-split would cost only 95 cents per day to run, or about $28.50 per month.