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

Anonymous Published: Dec. 11, 2017, 1:07 p.m.Last updated: Feb. 25, 2019, 6:24 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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