We spray foamed our entire house and the humidity shot through the roof in the late spring and summer months (65%+) and had to run a dehumidifier constantly negating any benefit from our solar panels. Fall and winter were great because we saw a major decrease (like 40%) in natural gas usage compared to that time frame the previous year. However, our home was built without a scuttle because they weren't code yet meaning that our home air got stale quickly and wasn't able to be exhausted through the now spray foamed air holes. We then installed an ERV and it made all the difference in the world.