Are there any Single-room Heat Recovery Ventilators or Energy Recovery Ventilators on the market that work with American mains power standards?  I've been searching, but all I can find on the one hand are European, 230V-using single-room ventilators, and on the other hand, American whole-house ventilators.  I really need a single-room model, with a "trickle" mode quiet enough to be suitable in a bedroom.

I hope somebody can point something out to me.

Maybe try Panasonic... they make ERV/HRV for use in a bathroom. I don't see why it wouldn't work in a bedroom.

http://www2.panasonic.com/consumer-electronics/support/Building-Products/Ventilation-Systems/Energy-Recovery-Ventilators/model.FV-04VE1

It's an ERV, not an HRV. Note the region-map on p.7 of the manual:

http://www.panasonic.com/consumer_electronics/ventilation_central/pdfs/FV-04VE1-E.pdf

"...can perform optimally..." means it will achieve reasonable levels of both humidity & temperature exchange. In winter months it will have lousier humidity exchange and will spend some energy on defrost cycles, but it will still provide sensible-heat exchange. You can use it at sub-freezing temps, but don't expect it to humidify the incoming air stream in cold weather, and it's sensible heat exchange might not be quite as effective as the simpler heat exchangers of an HRV during cold weather extremes.

Thanks for pointing me to this info.  I have a few questions about this model, though, and I can't seem to find a link to download any more detailed info.  I can email them, but I figured I'd ask here first:

-Dana1, so what you're saying is, even though I live in their "B" zone, if I run it all the time in January, this is perfectly reasonable?  I sacrifice only humidity, and no worse than if I had a HRV instead which never recovers moisture?

-Quoting, "Dual setting air volume for 40/20 or 20/10 CFMs" - do the 40 and 20 numbers represent burst modes, and the 20 and 10 numbers represent trickle modes?  Or does it offer trickle mode at all, the way the European models do?

-One of the special requirements of a bedroom installation is that it must be especially quiet.  This unit, for instance, claims that it's inaudible from 3 or more meters away: (http://www.vent-axia.com/range/hr30w.html).  I can't find the information about the noise generated by the Panasonic FV-04VE1.  The "Product Cross Reference" lists Sones ratings for all their other "Whisper" fans, but not the WhisperComfort.

Thanks to anyone who can answer any of this.

The FV-04VE1 has a noise level of less than 0.3 sones @ 20cfm, and 0.8 sones @ 40cfm according to the technical specs here:

http://www2.panasonic.com/consumer-electronics/shop/Building-Products/Ventilation-Systems/Energy-Recovery-Ventilators/model.FV-04VE1.S_11002_7000000000000005702#tabsection

(It's also on p4 of the manual I referred to before.)

The sensible-heat recovery efficiency of this unit will be somewhat lower than a pure-HRV during cold weather, but it'll be fine to run it in January. When it's below freezing but above 20F outside it'll be running in a non-heat recovery exhaust-mode at low speed 1/3 of the time to keep from frosting up. When it's below 20F outside it automatically reverts to exhaust-only, running 10minutes/hr to test outdoor air temp. (See P4 of the operating manual: http://www.panasonic.com/consumer_electronics/ventilation_central/pdfs/FV-04VE1-E.pdf )

Setting it up to run 20cfm vs 40cfm is hard-wired at the time of installation. (see the wiring diagram on p8). When auto-switched into a defrost cycle or exhaust-only mode the blower speed drops to 10cfm.

As for the Vent-Axia HR30W's 35 cubic meters/hour "trickle mode": With ~35.3 cubic feet per cubic meter, and 60 minute per hour, 35 cubic meters per hour works out to 20.6cfm (about the same as the Panasonic's low-speed operation), whereas the 50m3/hr high speed operation is ~30cfm (ony 75% of the Panasonic's high speed flow.) Their sensible heat recovery numbers are comparable too --66% for the Panasonic, ~70% for the Vent-Axia. In total energy recovery the Panasonic will likely outperform the Vent-Axia by quite a bit if you're in a more humid part of zone B on the map.

I stumbled upon this question a bit late, but thought that I would still post the link to the company that has single room very efficient ERV/ HRV units available in the USA.
www.ventsus.com
The central location is Cincinnati, Ohio.

try this.....

www.foursevenfive.com/index.php?main_page=index&cPath=70_71_98_99&zenid=c280c6095be550faf3b069003118ad07