We've been keeping our eyes open for a warm mist humidifier made without polycarbonate plastic for quite a while and we kept coming back empty-handed. Safe Mama reported that her search had been unsuccessful too.
Last week our kids passed around a heavy duty cold, so I dug out our old standby Vicks humidifier. I decided to check out the type of plastic used just in case it was made with safer plastic by some off chance. I was surprised to find the recycling code #2 (HDPE) on the white base and #5 (polypropylene) on the blue outer and black inner pieces. All this time I had a great option sitting in my linen closet and didn't even know it!
You can find the Vicks Warm Steam Humidifier for about $16.00. There appears to be several other brands with options like Vicks, so we'll be checking into them and publishing a full list of BPA-free humidifiers soon.
If you're looking for a cool mist humidifier, we confirmed that all Crane humidifiers are BPA, PVC and phthalate-free.
The PureGuardian Ultrasonic Humidifier is BPA, PVC and phthalate-free (keep in mind that all humidifiers have a PVC wrapped cord).