Simple answer, what temp is the water that falls out of the sky?
It varies, warmer in the summer and cold in the fall and winter.
In the spring and summer when the plants are blooming and foliage is strong, it is warmer.
Your plants in the house are in a false environment, like it is constant warm all year (tropical).
Sooo, use water temp that is close to the ambient temp inside your home.
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