Hi Robert,

Some good points. A fully programmable timer with a remote control
would be a smart way to go and at under $25.00, the price is
reasonable.

I should add this particular Venmar operates at two speeds ("normal"
and "boost") and at this lower setting the outside air portion is 70
CFM. As mentioned, I run mine in "recirc" mode most of the time and
only use the fresh air option when showering and at other times as
required for humidity and odour control (a simple wall control located
in the main bathroom allows me to change these modes and to turn the
unit on and off).

Depending upon occupancy load and living habits, showering and cooking
can be major sources of indoor humidity. Here in Nova Scotia, it's
not uncommon for people who heat with wood to store a portion of this
wood inside their basement; as you can imagine, the amount of moisture
given off by this wood as it dries can be significant. I would
closely monitor indoor humidity levels and adjust run times
accordingly. With the remote control timer you've recommended, that's
a fairly simple matter.

Cheers,
Paul

On Wed, 11 Oct 2006 15:50:12 GMT, Robert Gammon
wrote:

Any of the HRV models will work in your home.

Run the calculations for volume of the air in your house and divide that
by the amount of fresh air you want brought into the house. Divide the
answer by 60 to get hours to exchange rate

Answers of less than 3 hours and you may want to cycle the unit on a timer.

For example 1200sqft with 8 ft ceilings is 9600 CU FT.

Using Paul's installation as an example above, it brings in 105CFM

A constant 105CFM does a complete change out of the air in your home in
1.5 hours.

So a reasonable approach is to use a timer that will allow you to run it
20 minutes out of every hour for a complete change out in 4.5 hours
Paul's lamp timer idea is useful, but you may want a slightly more
flexible timer for this application.

For example, this timer has a remote control and allows 20 on/off
cycles. Not enough to cover all 24 hours, but close and very inexpensive.

http://www.smarthome.com/1125.html