This isn't about a PUP. It's about a tent. Just curious, since we've been discussing heating on other threads, if anyone has any insights to how this tent does what it does. Here is the tent we have had for about a year: https://www.walmart.com/ip/Bushnell-Shield-Series-12-Person-Instant-Cabin-Tent/41737127 I really like the tent. As huge as it is, it goes up in literally 3 or 4 minutes. The take down is just a few minutes longer. The things that really intrigue me is that this tent is kind of naturally air conditioned. I thought it would be good for Florida summers, since it says it's build to keep the tent cool. I didn't expect it to really do much, the biggest reason for buying was size and ease of set up. This tent is so cold, I would never recommend it for anyone that doesn't live in the warmest of climates. I use a heater in it at night, in my section, even in Florida. It's crazy because I originally planned to use one of the end vents to put a window unit, like we had in past tents. There was never any need. A couple of curious things are the rain fly sits a good 9" to 12" above the top of the tent, instead of right on top. The rain fly is also reflective on the underside. Those seem to be the only two differences between this and our previous tents. Another interesting phenomenon is that there is no clammy feeling in the morning in this tent. None. Not even a tiny bit. Nothing has to be aired out, even in humid Florida. So this got me thinking how I could reverse whatever makes this tent so cold, to make our PUP warm. But it doesn't make sense to me. Shouldn't the reflective surface be facing UP to keep the heat out? It's not. I'm going to make Gizmos for our PUP, but confused on if the reflective should face up or down for heat.