Thank you for your question. The amount it costs to run per day is specific to the owner due to varying energy costs, climate zones and amount each individual uses the system. For instance, running the system at maximum power on a very hot and humid day in July will require more power than running it at minimum power on a cooler spring day in April. However, this system is very energy efficient. It has a SEER (seasonal energy efficiency ratio) of 17.6. Having a higher SEER will help you to save money on your energy bill. For more assistance, please give us a call.