wrote:
Robert Gammon errs again:


Canada says all new houses there should be equipped with an air to air
heat exchanger that ventilate the house several times a day (I forget
the actual spec)


Do let us know when you find this alleged spec. Meanwhilst, you might
explain the new houses in Ontario with exhaust fans vs ERVs.


Even Washington state mandates a ventilation system in all new
residential construction (they don't say what it has to be just that
there is one)


Sounds like an exhaust fan would qualify there as well.

Nick


http://r2000.chba.ca/What_is_R2000/R2000_standard.php

YOU pointed the spec to us, NOW READ THIS PAGE

Note that this is not a MANDATORY construction method, it is a voluntary
program designed to influence both builders and consumers.



R-2000 homes will be blower door tested to ensure that the required
standard for air tightness is met.

Mechanical ventilation systems must be provided. Most R-2000 builders
use a Heat Recovery Ventilator



Note that not all R-2000 homes are REQUIRED to have HRVs, they point out
that builders who follow the spec to produce an R-2000 certified home
will often choose to include an HRV as the chosen ventilation method.

And Canada is far more than just Ontario, and Ontario is far more than
the southeastern region that lies just across the lake. Toronto
winters are very different than Chicoutimi, or Calgary, or even
locations in Ontario in the north and west regions. R-2000 addresses the
needs of the ENTIRE country.