Is an air conditioner that important? Ditch that as yes, those can cost an arm and a leg to run.

Firdges and computers are nothing to be alarmed about.

Don't leave your TV on for so long. 18hrs a day? You watch 18hrs of TV a day? My TV is on maybe 3 hrs a day, unless I fall asleep in my Lazy-boy, then it can be ony for hours.

Just cut down the use of your electricity. Don't leave stuff on that is not needed, and an air conditioner is not needed.

200W of lighting for 18hrs a day isn't anything to be alarmed about either.

I ran 200W of CFL's and a 150hps for a good 2 years, and it costs me maybe an extra $25 a month, so as for your lighting, that's nothing.

I ran a 1000Whps bulb for a good 6 months straight with no problems from police.

$150 electricity bills for summer (I assume..?) is nothing uncommon. When you start getting $700 bills, then there is something to worry about, but my monthy bill for electricity is about the same as yours. With me running about the same amount of lighting.

I don't think you have anything to worry about. Maybe it was just one of walkie phones I see around that you heard. Who knows, but if you are that worried, I'd cut out the air conditioning.