I think bleach was the old way and vinegar is the new. I think the vinegar is easier on the metal parts. I was told once a month by my builder. Do not mix with water as you are pouring it into a pan of water in the air handler. I think bleach was mixed with water and maybe that is where the 50/50 that was mentioned came from.
I was also told to set the humanist no higher than 60% and AC no higher than 80 degrees when leaving the home for a few weeks. The home is new so these settings might be for the first year as water evaporates from the new building material.
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