reflectix in the windows will help - ......but thinking you can maintain 70 degrees in a popup may not be very realistic. Tent material has no real insulation properties.
We did not use gizmos or reflectix when we had our highwall popup, only used the AC to really remove humidity, and keeping the popup camper in the low 80s with lower humidity was very comfortable for us when the outside was in the upper 90s. at 70 degrees, we would be freezing. And really, we only needed to cool it down to sleep, which cooled down fast enough once the sun went down. We were always outside during the day and were not sitting in the camper.
Now with our hybrid, we do have reflectix and gizmos, helps alot as our back bunk can get super hot (no AC vents back there). They work very well there to keep it comfortable.
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HTT: "EscapeII" 2016 Shamrock 23WS (current)
PUP: "Escape" 2010 Rockwood HW 277 (gone)
TV: "Gill" 2022 RAM 2500
Just us gals (me, Sis and our daughters)
We spend alot of money to go sit in the woods
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