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A humidifier works by drawing air through it, and removing the moisture from the air as it passes through. The air that's pushed through has to come from somewhere, and go somewhere else. If the floors are open to allow air to pass, then air certainly might pass between the floors. If you believe the air currents are causing exhaust fumes to be drawn to ...


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Yes, that should be either plugged, or plumbed as a secondary drain. A 3/4" MNPT plug should do the trick.


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There is an optional add-on part for HVAC systems called an economizer. An HVAC economizer is a dampered vent designed to save energy and give the cooling system a break. Sensors within the economizer compare the outdoor temperature and humidity with that inside the building. –Google When you call for cooling, the unit decides if it needs to run the AC ...


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The term you're looking for is "whole-house fan". It's a big fan that can blow outside air, inside. I have one in my house and they work very well for your use case. Be warned that whole-house fans are notoriously difficult to insulate and air-seal. When winter rolls around, the last thing you want is a huge hole in the side of your house through which ...


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You're looking for the V in HVAC (Ventilation). There are indeed systems that will pull in outdoor air, filter it, and supply it through the home. These systems would likely be in addition to any heating or cooling equipment, not as a part of them. To be specific, you're looking for a balanced ventilation system. Talk to your local HVAC company, they ...



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