Reply by OSU55

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Posted on Tapping into Plenum for temp AC in Fl garage shop

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2658 posts in 2868 days

#1 posted 07-13-2018 12:11 AM

Other than all the CO discussion, it is not a good idea. Even if your AC unit is oversized and could handle the increased load, there will be an increase in latent cooling (condensing water). Home AC systems are closed systems except for whatever leakage factor a particular house has. The leakage into the house from outside is the make up air system. For every cfm into the garage, an additional hot humid cfm leaks into the house (which is a lot of load in FL). Not only must the air and water vapor be cooled, a lot of that water vapor will be condensed. This creates more water to drain.

Remember the increased negative pressure? By creating more negative pressure in the house, water will not drain as quickly because of the negative head inside the house, and can stop the water draining if high enough. The water overflows the drain pan and you can guess the rest. I have direct experience where this type of situation existed. The solution in each case was to return the AC to a closed system. I would not recommend doing it even temporarily for a week or 2. There are several ways as have been mentioned.

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