Can you go to lost property or the charity shop and bring a job lot of cardigans, jumpers and wraps into the office so when she forgets to dress suitably in a morning she can still put something on once she gets to the office?
And I believe they have sunshine in Florida, so whatever she's planning to do about the light out there should surely work here as well. Unless she's planning to make Florida pull all it's blinds down and turn it's lights on all day?
She is entitled to have her work space reviewed and adjusted so that it is suitable for her disability.
I can't see that this will involve needing the blinds closed and the heating on, but it might mean that she gets to move her desk away from the windows if possible.
Can that be done anyway? Can she move to the back of the office and you to the front or whatever, so you are by the windows and she is not?
Or can you open the blinds at your side but she have her back to the light?
Can you have an office screen installed, so that she has a partition between her and the windows? They can be very effective for blocking light and drafts.
Or can you say that you will open the blinds in the morning but close them later in the day (or vice versa) so they are open when the full sun is not on your office window but you still get part of the day with daylight on you?
And get a fan for your desk so you have something to combat the heat? Ask your boss to pay for this fan, so he can then see the pointlessness of running a heating system and a cooling system simultaneously in the same office.
And while you are at it, ask for those lightbulbs to be fitted, the ones that are meant to be like daylight, so he can also see the pointlessness of sitting in the dark under artificial lights when you could just have a bit of daylight now and again.