I hope I'm hatching on the 14th, but this time of year, holding humidity in the incubator is tough.
I have hot air heating in my 200 year old house and things are dry, dry, dry!
BUT, for the next batch of eggs, I have a plan.
I have an unfinished bedroom upstairs with no heat ducts. Therefore, the hot air heat doesn't dry that room out. And I can place some bowls of water in the room too, helping to keep the incubator humidity steadier. The incubator will be in charge of the heat level - I'll watch the humidity.
Funny though...last hatch season from May on was very humid and lots of folks here told me that they had poor hatches from their incubators.
It's a battle....but maybe the broody hens know something we don't??? lol