Quote:
Originally Posted by ecomodmonster
Do you think its better to block up all air vents and use a dehumidifier to fight mold?
why do ecobuilders use large heat exchangers when they could just use a dehumidifier?
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Because you exhale more than just water vapor. Building codes require a minimal rate of replenishing the house's air, for example 50% of the house's volume per hour per person. Water vapor is the least of your worries, what you want to get rid of is CO2, carbon monoxide, vapors from chemicals, plastics, etc.
A dehumidifier will help if you live in a particularly humid area, or if your house has an old ventilation system which can't keep up with your water production (many occupants, lots of cooking). A heat exchanger can also help dehumidify the incoming air.