S/H not working to well for me.

[dorinda]

I have several Orchids I planted in S/H some as far back as Oct.and others in Mid Nov. nothing is happening is it do soon to expect any new roots.I have them on a heating mat my sun room can cool down at night, it is heated. I tried to stay with cool growing ones but things are not looking promising. I do not live a warm climate, Northern Wi. I get great Morning light and late afternoon but that is not real intense.