Blossoms Dropping With/in 12hrs. Why Is This Happening?

Question

Plant is potted in a clay pot. The pot sits in a south window. Room temp between 68 and 72 degrees.

Answer 1

Unfortunately, there is a lot of information missing. You don't mention what the plant is, in question. That will determine the care required, and the reason behind the bloom drop.

Many plants will do this in response to a drastic change in environment. Be sure to match the plant to where it came from, so that you can be sure that it will survive in its new location.

https://www.gardeningknowhow.com/houseplants/hpgen/acclimate-plants-indoors-winter.htm