06 Jun '14, 11am

A Vermont house that can be heated with just half a cord of firewood? It's true.

A Vermont house that can be heated with just half a cord of firewood? It's true.

He continued, “We also have a Zehnder ComfoAir 200 HRV (HRV). Balanced ventilation system in which most of the heat from outgoing exhaust air is transferred to incoming fresh air via an air-to-air heat exchanger; a similar device, an energy-recovery ventilator, also transfers water vapor. HRVs recover 50% to 80% of the heat in exhausted air. In hot climates, the function is reversed so that the cooler inside air reduces the temperature of the incoming hot air. . When the Zehnder unit goes into defrost mode, it shuts down the outdoor air intake, which can depressurize the house. So we learned to shut off the Zehnder unit — to power it right down — before lighting a fire in the wood stove. I later figured out that the Zehnder has an ‘open fire mode’ that can be engaged instead of turning the unit off. That way the wood stove drafted much better during the initial start. We a...

Full article: http://www.greenbuildingadvisor.com/blogs/dept/musings/ve...

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