You may not realize it, but you probably have quite a few appliances that are constantly sucking power even if you are not using them. Your T.V., VCR, DVD Player, Sound System, etc can all be plugged into a power strip. When you are not using them shut the strip off. The same goes with the computer, it's not enough to just "Shut it down" the thing is still sucking power.
Next invest in compact florescent bulbs (the squat curly-Q bulbs). They cost more than regular bulbs but they put out more light at a much lower wattages.
Doing just these two things will save you money right off the bat (the bulbs will last up to five years so they take time to pay for themselves but it's worth it). I switched every bulb in my house to these bulbs and noticed a VERY significant drop in my electric bill in the first month.
Next, if you can, move as many of your animals into one room as possible. It is much more cost effective to heat or cool only one room that it is to try to do the same with individual racks and tanks throughout the house. The heat element on the individual setups is constantly fighting your room temps and this costs money.
Since you live in a warm part of the country... you most likely wouldn't want your animals in the basement if you have one. Basements tend to stay cooler than the rest of the house. Instead, if you have an attic, you could convert THAT to your reptile room if it is big enough...(I don't know what kind of architecture is common in residential areas in Florida). Otherwise, an up stairs room that you insulate well and cut off from the rest of the houses cooling. This way you are using heat's natural tendency to rise to your advantage.
Try looking up your local electric company online. Their website will undoubtedly give you the best money saving tips for your local area.
Good luck.