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When it is -10F you can open all the vents and it will still drip. as long as the interior temp of the shack is 50 degrees warmer than the outside temp, she is gonna drip. This has been true of all shacks I have owned, Shappell, Clam, and homade. The Thermal cap shacks are new for this year, but I have fished out of similar quilted shacks from Canvas Craft. The quilting ends the drip. If you do not fish in super cold temps with your heater running on high, you may never run into "the drip".
I think they have a pill or a shot to cure "the drip".
i can't believe how much frost was built up in your shanty, my clam scout never gets that bad maybe a little on the walls
I have a Clam Thermal Base Camp. No matter how cold, I never, ever have had condensation. I run a Buddy heater, and it works very well. I was out today in gale force winds, the worst I ever experienced. I hadn't realized how bad it was. I thought the frame might give, it was that rough, I even had to go out at one point and re-adjust the tie down cords to the ice anchors, fierce. Taking it down was like wrestling with a huge blue angry square kite. Generally, I keep the two vent tabs open, I run a small Clam fan hanging off the inside and all works very well.