What is the optimal temperature for making coffee, specifically in an AeroPress? I use an Aerobie AeroPress to make lattes. The instructions recommend a water temperature of 175° F to be used in making the concentrated coffee. Since I am making a latte I also heat milk and froth it. The instructions do not specify a temperature for the milk so I assumed 175° F as well. 175° F I have found is too hot for the end product. When I put it in my coffee mug for the day, it is too hot to drink for about 1.5hours after creation. 

Can I lower the temperature of the water or should I lower the temperature of the milk or neither to still get good taste and end product?
When making espresso with a machine, normally the ideal temp is around 200F. So I would most definitely not use cooler water.

175F is very hot for steaming milk--for me that would be way over-steamed and scalded. Most of the resources I've found say to steam to 150-160F.

I've actually found that even when the thermometer says 150F, it's over-cooked for my tastes. What I do now is go by feel. I steam in a stainless pitcher and keep my fingertips on the sides. When it's too hot for me to hold for more than a second or so, I stop.