The Phoenix area is expecting 119-120 today with 117 on Monday through the remainder of next week. To prepare for this heat - we have sun screens on all our windows and also pull down huge sun shades to block the sun on the south side. It does darken the house a bit but makes several degrees difference in the house. Also we cool the house down to 72 (hey - when you are used to such high temperatures your blood thins tremendously) overnight and minimize opening/closing doors so the house will stay cooler longer. We are also on a time of use power plan so it cost 4x as much to use power during the peak hours 1 pm to 8 pm. By pre cooling the house it will stay pretty good in the house until about 7:00 pm. At temps this high we may have to use a little bit of air conditioning tonight before 8:00 pm. We also try minimize driving in the heat of the day - at around 117 to 119 the asphalt on the roads begins to melt so your tires sink into the road bed and it kicks up tar on you car.
I do do use LED lights in the house as they are super bright and don't heat up!