ERVs are predominantly used in humid climates where moisture in the intake air is a big concern. As air goes through an ERV, it’s both transferring heat from the warm airstream to the cold airstream and also transferring moisture from the wet airstream to the dry airstream. It always goes from a high-moisture environment to a low-moisture environment to equalize itself out. So where heat energy always flows from hot to cold, moisture works in kind of the same way. An ERV transfers both heat energy and moisture. An HRV transfers heat energy from one air stream to another. Interviewer: What’s the difference between an HRV and an ERV?Īubrey Gewehr: Well in a word, the difference is moisture. Where the loads are appropriate, it’s quite easy to accomplish this. That’s a real growing trend for green buildings, where one efficient system will provide both the heating and the cooling. Outside of ventilation trends, we’re also seeing a lot of heat pumps being used for heating and cooling needs, especially air-source heat pumps. By having an independent network for the HRV, you get the air into and out of the ideal rooms, have easier and more consistent balancing of the fresh and exhaust air, and higher heat transfer efficiency as well. People are realizing the most effective way to get good ventilation is through separate distribution. Traditionally, the default method to install an HRV by just tying it into an air handler or furnace and let that central HVAC system do the distribution. Also, we’re seeing a better understanding of the importance of decoupling the HRV from the central HVAC system. As buildings get air-tight, mechanical ventilation becomes critical. Specifically to HVAC, we’re seeing more and more whole-house balanced ventilation systems being included and most of those are HRVs or ERVs. Interviewer: What kind of green building trends are you seeing in the HVAC industry?Īubrey Gewehr: All kinds of exciting things are going on. I am a licensed mechanical engineer with a background in HVAC consulting work.

I’m the Northeast Technical Sales Engineer for Zehnder America. Interviewer: Could you introduce yourself, Aubrey?Īubrey Gewehr: My name is Aubrey Gewehr. Zehnder Interview Series: Aubrey Gewehr, Technical Sales Engineer

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