26 Apr '12, 3pm

Green Building Q&A: HRV/ERV vs exhaust only issue...

Hello- I'm looking for some advice on ventilation. I live in VT in a house I built in 1997-- 1800 sqft, fairly well insulated, tight but not super-tight, main heat source is woodfired thermal mass heater. Open floor plans. Ac/H were estimated (not tested) at .5 at the time of construction. When I built the house I installed ducting for an HRV (exhausts from upstairs and downstairs bathrooms, two returns on each floor.) However as the house seemed far less tight than I expected, I never installed the actual HRV unit. As a result there was no bathroom ventilation. This has never been an issue until the last couple of years when we have had long periods of very high natural humidity, even into the winter. I have seen some mildew developing in the downstairs bathroom over this time. As I am renovating that bathroom (for other reasons) I thought it was time to finally get the v...

Full article: http://www.greenbuildingadvisor.com/community/forum/mecha...

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Green Building Q&A: To ERV or Not?

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