A few questions for you - because I'm good like that :)
1) On a day like today would you like to be sat next to a window in full sun all day?
2) On a day like today would you like to be without any clean, fresh water for 48 hours?
3) On a day like today would you like to be sat next to a heat source of some kind? TV's and computers kick out a massive amount of heat.
4) If you are lucky enough to have a fan running, would you want it to be blowing directly into your face for many hours a day?
If you answer "NO" to just one-of-these questions, then please remember; if you don't like it, your flowers don't like it.
Keep them away from any kind of heat source, or draft; every-other-day (preferably every day in the temps we are getting at the moment) take a sliver from the bottom of their stems and replace them into clean, fresh water - imagine how grateful you would be for a glass of cold, fresh water when you are struggling to keep going in the heat.
On a non-flower related side note - if you walk your dog during the day (from 10am - 6pm - even an hour before and 2 after this is pushing it) during this heat, then you are an arse. If you leave your dog locked in a car for even more than one minute, I hope one day someone does the same to you and walks away indefinitely.