A renter moved into a unit and struggled with air quality on the first night. When they looked for the HVAC filter, they found one so caked with dust and grime that they guessed it had been ignored for years.
Here's what to know
According to a Reddit post, the search started when the renter tried to understand why the air in the apartment felt so rough.
"The first night my lungs hurt so bad," they wrote.
An image in the thread showed a dark, heavily clogged filter they pulled from a ceiling vent.
Because the vent was overhead, the poster said it was awkward to deal with the filter. They also described an unclear maintenance trail, writing, "This lease has been renewed for 5 years with revolving tenants and different people each year."
That detail led commenters to debate whether filter changes should have been handled by tenants or the landlord.
For some readers, the neglect stood out against their own habits. One commenter, describing a much tighter maintenance routine, wrote: "As someone who changes theirs out every 90 days, this is wild."
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More background
Replies quickly shifted from disgust to health concerns. One person said a similarly neglected system "gave me a sinus infection," while another warned, "If your lungs are hurting, betting there is mold."
The original poster later added, "I literally thought I was wheezing when I came here."
Poor airflow, more dust circulating indoors, and extra strain on equipment that may already be aging can all follow from a badly clogged HVAC filter, especially in a high-turnover rental. In this case, the original poster said the duct "looked clean," but they also admitted that their "eyes are really bad," leaving open the possibility that a deeper cleaning could still be needed.
Many renters have limited control over the spaces they live in, but working with landlords or building associations on outdated housing rules can lead to positive change and more comfortable living.
What can be done?
Suggestions in the thread focused on next steps rather than just the grime. One commenter urged the renter to "vacuum out the duct to be safe," while another said, "You definitely want to get the evaporator cleaned by an HVAC person or look up how to DIY."
A third suggested checking the replacement filter again in six months and using an air purifier if the lung irritation continued.
The original poster added that they had already bought an air purifier, and another commenter said they'd be tempted to send the landlord the photo and ask about duct cleaning.
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Where can I learn more?
Unfortunately, tenants often deal with household problems that should be a landlord's responsibility.
• A renter shared photos of a disgusting air conditioning unit that commenters feared was black mold.
• In Missouri, a tenant said an outdated A/C system left them distraught and overwhelmed indoors.
• One tenant said an overseas landlord waited weeks to fix broken air conditioning in 90-degree heat.
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