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What should I be looking for in a heat recovery ventilator?

Adam Y. Published: Dec. 11, 2017, 1:07 p.m.Last updated: Nov. 30, 2019, 2:02 p.m.

I have been doing some reading and I think I should  install an HRV, I have on older home (1970s) and it doesn't have one, wondering what I should be looking for. thanks

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