I went back and looked for the last three years, one year prior to the install, thankfully all online for us. The usage has really not changed much , looks like an average of maybe 9-11KwH per month for mine. It is a 12000BTU unit and cools andor heats my garage easily. My garage is 28x33 fwiw and has 11' ceilings. Alos keep in mind around here AC's operate 7-8 months a year. I also have a large house and my electric bill is not small for sure. Plus we have had two rate increases since covid and three since install which has been a much larger increase to my bill than the mini split was for sure.