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Good morning, Rachel. I am so sorry to hear that Avi is not well.
There are a lot of things that we can see cause wet sneezing and the crusty, yellow production is certainly a major concern, along with him being at the bottom of the cage. This is probably not related to the temperature as 71 degrees is a perfect temperature for a dove.
I would be more concerned about a bacterial or fungal infection which should be treated by a veterinarian. If you do not have a vet that can see Avi this weekend, please post back your city, state and zipcode and I'll be happy to help you find someone that can help.
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I am not able to offer you a phone call, at this time. I am happy to type back and forth until your questions are answered, however.
I am going to post some resources for you here. If you're unable to make it out, perhaps someone can make it in.