My Kaa-2 is in the basement. I turn on the Shop Vac when dumping 5 gallon pails of coal in hopper, and when emptying ashes. My coal storage is outside, in order to keep the black coal dust out. I have an exterior Bilco style door going to basement. Sometimes carrying buckets of coal down into the basement gets old. Same with carrying ashes out. Other than that, the whole set up works out very well. I'm very happy with it. No lost BTU's with boiler in basement. But, should the boiler idle in summer months, it does work against AC. I didn't feel any heat, just went through much more coal. Now I shut down in summer. Cap off boiler opennings. Close ball valves on primary loop, and put small cubicle heater in ash door, which also works very well. However, I'm thinking if I had a bigger boiler, in its own centrally located building, I would heat the shop as well. No carrying coal/ashes up & down cellar steps.