@sunshine_eggo My apologies, I hadn't seen your last comment. I've built a small shed (45sq. ft.) as a music studio. My hope was a small solar system and small heater would be enough to heat it up for the occasional bouts of winter songwriting sessions. After my recent trials, I've concluded it is too small to get up to temp from a really cold start, like 35F, but it can top off the room if starting at a moderate temp like 60F and give me solid performance. I may need to upsize if I want more use out of it from cold starts. Luckily I do have a home and a warm living room.