I purchased this heater late last Fall. Took it on a week long pheasant hunting trip to western Kansas back in October. I use this heater in my RTT. It works great. When I used it, the low temperatures where low to mid 20's(F). It warms the tent up quickly. (~10 minutes) I used it to heat up the tent before going to bed and again in the morning before rolling out of my bag. Noise isn't an issue for me. I set the unit just outside the tent and use separate hoses to pipe the supply air in, and the return air out.