I dropped the RH in my humi.....

[shilala]

Originally Posted by stevef2005

Well I have been keeping mine at 66-70. I will be rethinking it after my run in with mold. I am thinking probably the 62-65 range will be my new target range.....

If the RH hits 80%, I'll have mold.
That's actual RH, not whatever a hygrometer may be reporting. I have to take into consideration how accurate the hygrometer is, and what it's normal deviation is.
Mind ya, that 80% used to be the old rule of thumb. Now Health Agencies are saying that if the RH stays above 70% indoors for extended periods of time, mold will almost certainly grow.
Notice that this stuff doesn't jive with the 66-70RH you mentioned.
That suggests that your hygrometers are wholly inadequate, way off, or flat out broke.
Lowering your setpoint is an excellent idea, but you may not be going low enough to make up for how screwed up your hygrometer is.
Good Luck, brother!!!