#2 How well does it retain the heat in?
Depends on what lights your running but im running 3 different leds in my 80x80x80 and it does stay much warmer and humid int here with out a exhaust fan but i have 4 different tents all cheaper tents and my ipower is one of the niceist so far then my appolo topogrow and then the lagarden any how thats my ifo i hope it helps im greengrower420 on youtube u can see everything ive baught from amazon