best humidity

[piggiemummy03x]

would just like to ask what the best humidity is for piggies to live in is? before we moved we had trouble keeping it below 70/80, now we have moved it sits around 30/40! just want to check my girls are comfortable

 

[piggieminder]

I run my dehumidifier at 50% which was the recommended amount in the instructions. I don't know about piggies but this is the first winter I've lived here we don't have mould upstairs despite opening the windows every day!