Being in Florida my main concern would be Air Conditioning (Preferred model is the Model S)
Is A/C available? If so, would it effect the mileage range of the car? And if so on that, by how much?
Air conditioning is required by the battery pack, so actually it isn't optional. The battery A/C is shared with the cabin.
it shaves off a few miles, so instead of 300, its something like 240-260, someone else can verify, but thats my assumption. if on all the time that is.
In my experience with the Roadster, it's not even that much.
If you turn the A/C on full, it pulls something like 4 amps (I don't remember the exact number). It seems like it was about 10% of the draw of pushing the car, although of course that varies a lot depending on speed. And remember that if it's not too hot the compressor may not be on all the time; and that some of the time it's on even if you don't use A/C because of the batteries, so figuring out the exact difference is pretty tough.
Plus the AC drain is by hour, rather than by mile, so there's a larger effect the slower you go. (See the chart at http://www.pluginamerica.org/drivers-seat/how-far-can-you-really-go-elec... to get an idea of the shape of the curve; although for magnitude note that chart is based on heat, which draws a lot more power than AC in the Roadster).
The amperage draw is less important to me than actual effective cooling ability. In Phoenix we just experienced August 2011 summer heat of over 110 F every day. Add heat from the asphalt etc. and its not every car that can keep the interior cool. And to stay in love with a car in this area of the country, the cooling capacity is as important to me as brakes and stability control systems...
My Porsche Cayman is barely up to the task of cooling the interior. It does manage eventually, but I will not buy it again.
The 2008 Mercedes GL diesel does a good job.
My 2007 Prius did a pretty good job.
The Mercedes gets family approval with the dual AC blower system. When we carry 7 people in the summer we realize how important this feature has become.
The Model S cooling ability with room for 7 and a glass top ( heat gain) in the desert Southwest is a concern.
If heat is a concern, and it would be in Phoenix for sure, get a white car with white or tan interior.
The glass top is heavily tinted, but I don't know what, if any thermal coatings it has.
here's an interesting youtube vid that addresses range and ac: http://www.youtube.com/watch?v=AO9Rku_ZNeM
The glass top is heavily tinted, but I don't know what, if any thermal coatings it has. (danielccc)
The Model S Features page says: "Blocks 98% of visible light and 81% of heat."
Here is another thread that is concerned with the heat induced by the glass roof, including some first-hand reports from owners: