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> Better off just opening the windows when it's only 2 kelvins different inside and outside! Except for all the pollen, dust, and pollution that doing so would

> Better off just opening the windows when it's only 2 kelvins different inside and outside! Except for all the pollen, dust, and pollution that doing so would also bring in. ERVs can cost as little as US$ 1000 for the units themselves: * https://hvacdirect.com/residential-industrial-commercial-fans-ventilation-products/air-cleaning/erv-air-exchangers.html https://hvacdirect.com/residential-industrial-commercial-fan... If this is a retrofit, there can be challenges with installation, but plumbing into existing force air ducts is a common scenario.

jaggederest 4y ago
Well, HRV/ERV have no built-in filtration in themselves, so they're exactly comparable to throwing open the window. If you run them before a filter, obviously they're better, but they have no inherent advantages to opening windows.
- throw0101c 4y ago
  > Well, HRV/ERV have no built-in filtration in themselves Open the linked PDFs for the Broan units and do a text search for "filter": you will find that they do. Further: even if they didn't, the RVs will have ducting for the intake, where you can put a box for a filter, which certainly take up space, but not a lot of money: * https://acinfinity.com/air-filter-boxes/ https://acinfinity.com/air-filter-boxes/ How do you install a MERV ≥8 filter into a window?