Housing - glass or polycarbonate

[Jan W]

I am thinking of putting a small greenhouse at the end of the tort garden where there is sun most of the day. The current plastic mini greenhouse and polycarbonate lean to is not good enough to leave the torts out overnight, I need better security against predators (and the weather).

Is glass better than 'double layered shatterproof polycarbonate glazing'?

Also are there good alternatives to electric cable heating if needed?
If not I will get the electrician in, as I like Sandy's set up.

Thank you