[jak92]

> "house fan" for 15 minutes or so every hour at night just to circulate the air in the house,

Depending on your climate, this could significantly raise the humidity in your house. Reason is that moisture from the AC coil are wet after the AC turns off. Typically drips off into the pan until next time AC cycles.

If you run the fan you will then evaporate into the air circulating some of the moisture just removed.

[Klathmon]

I live in florida, so I'm well accustomed to the humidity! But thanks for the tip, I actually hadn't thought about that.

Part of my home automation system is humidity sensors as well, and while they do spike over 65% sometimes (probably when we have the windows open), they stay around 55% to 60% for the past 30 days. Since I'm only running that fan cycle at night, when the AC tends not to run or not run as much, I'm guessing that helps mitigate the effects of that.

[asdkhadsj]

Doesn't that heavily depend on the design of the AC system? I know nothing here, so this is heavily a question.

I ask because I have a heat pump for cooling/heating, but the furnace is the blower. I thought when the fan ran, it pulled from the outdoor intake which is in a very different location from the actual heat pump coils.

Thoughts?

[jak92]

The air handler uses inside air only. The compressor heat pump is outside and either runs its cycle strictly on outside air

[abfan1127]

that moisture came from inside the house. When it drips, it usually drains outside the home. Perhaps it just pedantic, but it won't raise humidity, but it may lower less.

[cwbrandsma]

I live in a desert. If only that would release enough humidity to make a difference.