Thanks for the info, but where are you getting the 19C figure from? The small units on the page you linked all have a note saying 'adjustable thermostat' but only the $5000 'professional' unit gives a temp range (specifies "80F-200F+"). The 'pro' unit sure looks nice, though! If it can maintain 29C/84F, it's just the ticket!

I'm sure the other units can either go down close to 29C or could be modified to do so, but they're all priced at a lot more than you'd spend for a slapdash converted storage box special.

I admit to being both lazy and cheap, but I think I'm cheaper than I am lazy.