OK so Tracy, is your duck broody? the only thing she needs is access to WATER, as long as she can get into some water she will COOL herself down. I understand she's blind but again, Even though she is I'm sure she's still able to find food and water. If that's the case, she's all good.
As far as being cold, I doubt it. They can tolerate cold weather, all heat is processed through there feet. The feet makes all the necessary adjustments. So I wouldn't worry about a fan, I wouldn't worry about a heating lamp, I wouldn't worry about anything but making sure she has water.... and food. Let her be a mommy, she's GOT THIS..
I know you're trying to help but you may want to give up on this. I've told this person multiple times in multiple threads the exact same thing and she is adamant that she needs to mess with her broody ducks, put heat lamps over them, put heat pads under them and their eggs, and now something about adding a shower curtain? This is all in Las Vegas Nevada where it is very hot, so this poster is putting hot heat lamps and heating pads on possible broody ducks (we don't know for sure they're actually broody) and is probably overheating both them and the eggs. Also the eggs might not even be fertile because at one point they had separated the drake from the females and no word on if they were ever put back together so at this point the eggs may not even be fertile. Also the female ducks were still laying eggs, a sure sign of not actually being broody (which this poster was also told).
On the incubator front, they have stated that they are doing this outside. Yes, their incubators are running outside in the hot Nevada sun and elements. When told this was the problem and to bring them in, they said they can't because it would hurt a family member's health to run them inside. So this might give you some insight on why they are having so many problems. But now they're talking about different room temps so maybe they did bring them inside? We don't know.
The frustration you are seeing above is stemming from the fact that this poster posts multiple times across multiple threads (usually copying and pasting) asking for the same advice that they have already been given. They take none of the advice and come up with their own 'solutions' that don't work and then come back and ask for help again, rinse and repeat.
Anyway this post might also help anyone who wants to give advice to know exactly what this poster's set up is, so if you have any tips that might work with this kind of incubator setup feel free to post them, but at this rate I don't think this person will ever get eggs to hatch.
Edited by Pyxis - 5/24/16 at 3:29pm