I received this Facebook question yesterday from Amy:

Question for Clean Mama…when we come home from after being gone for awhile, my house smells “musty”. I smell the same smell coming out of the ac vents. We have lived here for 8 months, and I have never smelled this before. I thought maybe since it is so hot out, and the ac is running, that there may be moisture in the vent system? It is driving me crazy. I put a dryer sheet in one of the vents to see if it would be any better, but it doesn’t really help. I know that is just masking the smell anyway. Have you heard of anything like this before? Thanks!
Here’s my answer (disclaimer: Please realize that I am not an expert, I just play one on this blog):
I’m guessing it’s moisture somewhere – do you use a dehumidifier? Or if you have a crawl space that’s damp from a lot of rain, it could be travelling through from your basement/crawlspace into your vents if your furnace is in the same general vicinity. I’d start with a dehumidifier and see if that helps with the musty smell. Hope this helps!
It got me thinking that maybe it’d be fun to have a little Q and A here on the blog. Sound like fun?
Here are the oh-so-simple rules:
1. Leave a cleaning, organizing, or meal planning question in the comments section of this post. Depending on how many questions I receive, I’ll answer the questions in future posts over the next day, week, weeks, or month.
2. If you have a blog, leave the blog address with  your comment so I can link your blog in the post that features your question.
3. When I post my answer to your questions, you will have an opportunity to help others with their questions as well.
So leave your question and if you have a suggestion for Amy, you can leave that as well. I can’t wait to hear from you!