Hi Windsocked. I’ve lived in the SLC area for 40 years. I’ve had 2 tabs. The Alde system has worked great on both. We’ve camped well into the teens and been able to maintain 70 inside. A few things I’ve learned. 1. Heat rises, close the top fan vent and lock it. 2. Seal off the side air conditioning vent. 3. Keep all windows closed. If you’re worried about suffocating open 1 window to the open/lock position. 4. Use propane. I hope this helps.