Just because it is winter, do not believe that your house is safe from mold. It is not just frozen pipes you have to worry about. Just remember that melting ice on your roof may cause water seepage, which will cause mold. The mold will naturally begin to break down the components of your house, especially those containing cellulose, such as drywall, and wood.
Healthwise, mold can worsen respiratory problems in people afflicted with mold allergies. And then, there are molds which produce toxins, called mycotoxins. The faster water intrusion is dealt with, the less likely mold will establish a foothold.
If you’re in California, you might want to give us a call and see about getting an assessment from Byebyemold.