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I am building a high efficiency home in N. Minnesota, 2x6 construction, slab heat, spray foam insulation etc. Need to install an heat-recovery ventilator (HRV) unit, but only have space for it in the garage also with slab heat & foam insulation. Local HVAC pro's tell me it can't be done, but cannot tell me why. Any input would be greatly appreciated.

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    Not sure about HRVs in particular, but in general your HVAC system can't be tied into your garage because of the potential for carbon monoxide from car exhaust to work its way back into your house. – Robert Nubel May 9 '17 at 20:23
  • That's probably why--the potential for poisoning. Whenever I've seen an HVAC system in a garage it has been in its own room with a fire-rated door. What about in the attic? – isherwood May 9 '17 at 20:49
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Technically, yes, but you can't feed it back inside the house. The penetrations required would violate the firewall.

  • You could install a fire damper in the duct aligned with the firewall. – Lee Sam Jul 11 '18 at 1:18

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