Hey thanks 907PokeSmot. I called it a shed but it's actually made of brick, i figure if i insulate it enough it should be ok and retain the heat during the dark period, although the idea with a little heater is a good one.

What do you think of making the dark period in the daytime so the lights are on in the night when its cooler?

Do you think i will need some detection foil stuff to hide the heat or if i insulate it well enough the heat shouldn't show?

Can someone post some pics of what i need (passive intake with filter and a 265cfm fan)

Sorry for all the questions, quite excited about my little growroom

Peace

TB