In the summer I leave the wood feed for the rocket mass heater wide open. In the day, I keep the windows closed, and during the night I keep the windows open.

At night, the temperature outside is a little colder than the temperature inside. Since the temperature in the barrel is all about the same, the “p-trap” action is disabled. The warmer air in the vertical exhaust moves up and outside. This pulls air in through the wood feed, past the barrel, through the mass and out the roof. Air is moving, slowly, through the whole system. As dawn approaches, the mass has been cooled a bit - pretty close to the coldest point at dawn.

During the day, the temperature outside is warmer than inside. A cold plug happens. Air no longer moves through the system.

At the hottest point of the day, people tend to gather near the rocket mass heater since it is now the coolest part of the house. The mass feels quite cool.

Doing the thing about opening the windows at night is an old technique that cuts about seven to ten degrees off the hottest part of the day. I think leaving the wood feed open all the time, cools the room about five to seven degrees more at the hottest part of the day. Zero electricity - entirely passive.

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