We love our new 4 ton, 4 zone Carrier heat pump system but now that we have added a fireplace the humidity is way too low and we need to buy a standalone humidifier. 25% out of a suggested 45% tonight per the thermostat. What is a good brand/model and what is the best type of humidifier to add to our existing system? Should it be on the return or supply side of the indoor unit? I'm not necessarily bent on going with Carrier as we need to be cost effective though I'm quite happy with what we have from them so far.
I'm also very concerned about the mold and bacteria risk both in the room and the ductwork. How big of a health risk is this? We also just installed all new ductwork [custom and standard duct metal main runs and returns and flex supplies] and I hate to mess it up with mold or bacteria. I'm also concerned about condensation as a lot of the supply and return ductwork runs through the crawlspace which is not conditioned and can get quite cold [Asheville, NC] but I have not had problems with frozen pipes even when it got down to about 5 degrees last week. What are the real risks here for health and the ductwork?
Thanks for any and all suggestions and feedback!