Opening the windows would help, I'm sure. My wife worries about robbers, interlopers, and such being able to access any space of our home
. So she sets this battle up all the time. Funny you should ask.
I have placed the black expensive pipe insulation on most all of the boiler and loop piping. The boiler just has the factory insulation under the tins with no additional insulation. I'm sure opening the windows and obsecene amounts of insulation would cut down on the heat transfer to some degree. I say run it! If I was not sitting on a FULL tank of heating oil I would get 7-8 ton of coal next week and keep stoking. I do need to shut down to clean things up, though. I'm currently maintaing 1-1.5 inch of flame between the coal and ashe. About seven 5 gallon buckets a week giving about one ash pan per week.