AC can be amazing!

I don't mean to derail this thread, but since we have so many electric rate experts here, I want to ask a related question. Is the rate for electricity the same in all parts of town? I know it is priced on an increasing scale depending on usage. The reason I ask is that I rent a very large four bedroom condo on the Ixtapa beach. I do not use any A/C. This year I switched from one unit in the same building to another unit and the price was over double. I don't remember the kWh, etc. but for three months last year the bill was US $220 and this year it was $480. The real estate agent said the beach units pay a premium due to their higher value. Is this true or am I being lied to?

Thanks
Juan