Metal buildings and heat exchangers
exchangers should increase the heating performance by five to 10
percent, according to the U.S. Department of Energy. However, exchangers
must be added to the unit during its initial installment.
The ventilation rate of a traditionally leaky,
drafty home is determined by the weather; the outdoor temperature dives
stack effect in the home, and the wind just plain blows right through!
The colder and windier it gets, the better ventilated your house is.
When you build a tight home with a high-quality ventilation system, you
control the ventilation rate. Complaints you may have heard about
stuffiness and moisture problems in tight houses come from houses where
the builder did not install a ventilation system commensurate with the
quality of the house, or the system is not being controlled properly.
HRVs can be retrofit in most existing homes, but a blower door test
(check with your electric utility or heating contractor) should be
performed first. HRVs are generally only used in homes which require
mechanical ventilation, usually homes with a natural ventilation rate of
less than .35 ACH.
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