If you make sure that your equipment is in top notch order - your bill wont be high.
e.g. if you are running hawa wali refrigerant because 20 saal tajurba taknissan ustaad was too lazy to utilize a vacuum pump then your system efficiency goes down by about 40% and bill goes up simultaneously. Same thing if 20 saal tajurba person tries to top off R410a with a portable refilled can.
Its very simple logic. Do not cheap out on stuff that will bite you in the longer run.