A Maryland homeowner expected a sealed crawl space to make their house feel drier and more efficient. Instead, whole-home humidity climbed above 60% — a frustrating outcome that shows how moisture control can get more complicated when a home gets tighter.
Here's what to know
"My house was pretty much 50% or below, but now it's 60% and up," the homeowner wrote in a Reddit thread.
They said the shift started right after a Maryland crawl-space encapsulation was completed on July 16.
The readings dropped when the air conditioning kicked on, but otherwise stayed elevated.
Several replies focused less on the encapsulation job itself and more on what happens after a house becomes tighter. If outdoor conditions are humid but mild, the HVAC system may cycle less often, which means less moisture gets removed from the indoor air.
"The AC isn't running because it isn't hot and the air isn't being dehumidified," one user commented.
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More background
Humidity came down quickly after the thermostat was lowered and an "Over Cooling" setting was used, though that worked because it kept the AC operating longer.
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Replies also raised a few other possibilities, such as a fan that runs continuously, attic ductwork developing condensation, or a crawl-space dehumidifier sensor picking up its own discharge air instead of the larger space.
What can be done?
Practical checks commenters recommended include setting the thermostat fan to auto, inspecting ducts for moisture, making sure the dehumidifier is draining correctly, and asking an HVAC technician whether blower speed or humidity settings need adjustment.
If the house still feels muggy during shoulder-season weather, several commenters said a whole-home dehumidifier may be the simplest fix.
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One commenter advised, "Make sure your fan is set to auto and not always on."
The homeowner concluded, "I guess this is just the weather, and if I don't like it I need to get a whole home dehumidifier to have that constant perfect 50-60% humidity."
Where can I learn more?
These stories dig into the cooling habits and HVAC choices that can make a home feel more or less comfortable.
• Night cooling cut a $500 bill to $70, but humidity can erase those savings.
• In Florida, HVAC pros say viral AC saver gadgets are more gimmick than fix.
• Home efficiency experts say common HVAC myths keep homeowners stuck with outdated equipment.
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