5 Causes and Solutions of Bad AC Filter Smells

5 Causes and Solutions of Bad AC Filter Smells


One of those necessities to make your house pleasant is your air conditioner, but you don’t give it much thought unless something appears amiss. The most important thing a user can do to guarantee the efficient running of their AC would be to pay close attention to its cleanliness. Otherwise, polluted air might be circulated, leading to major health issues, including cough, allergies, eye irritation, difficulty breathing, etc. Unpleasant odors from the AC are among the first signs indicating it needs some repair.

5 Reasons for Bad AC Filter Smells and Possible Solutions to Fix it

Issue 1: Air Filters with Mold

Mold or mildew may grow fast inside the ac system when water is trapped in the air and furnace filters. During the winter, your heating system supplies the dryness and warmth necessary to keep these problems at bay. In contrast to your heater, your AC might hasten the growth of dangerous microorganisms. That will produce an unpleasant odor that will subsequently permeate your entire home.

A possible solution for this would be to call your AC expert instantly. He will come and take the necessary steps needed.

Issue 2: Odors of Dirty Trash or Rotten Eggs

There might be a gas leak if the air conditioner smells like rotten eggs. Gas leaks or partially consumed gas can cause carbon monoxide poisoning in gas-ducted air conditioners with add-on cooling. Due to killed pests, birds, or bugs in the pipes or duck system, it also smells like rotting eggs.

The first solution to get rid of this would be to open each window in the house immediately to ventilate the area and switch off the AC. Also, always pest-proof your AC to avoid such an unpleasant occurrence.

Issue 3: Stored Water

For your AC to work properly and efficiently, sufficient drainage is necessary. Your AC may stop removing water from the system when it gets blocked. This issue will become apparent when your air conditioner starts to operate less efficiently and emits an odd odor.

The solution to getting rid of the odor is to restore your unit to normal operation and switch off the system, then contact an expert who will unclog your AC and remove the extra water.

Issue 4: Unclean Air Filters

Every allergen found within your house, including fur, dust, soot, and pollen, will ultimately make its way to the air filter of your AC. As a result, you ought to change it every 30 to 90 days. Failure to do so could obstruct airflow and encourage mold growth and its accompanying odor.

Using high-quality Merv filters from a reputable company, which have a longer lifespan than any other air filters on the market, may be a solution. If not, you may arrange replacement installation on your phone’s calendar and set up reminders to alert you when the time comes.

Issue 5: Burning Smell

Burning odors indicate a problem with the fan, circuit board, or other electrical sections of an AC. This odor is most frequently caused by dust accumulation inside the AC, which can happen after a prolonged period of no use. When switched on after being off for some time, this dust can burn off and emit a foul stench.

Because of the urgency of the situation, quickly shut off your AC at the main switchboard and immediately call an AC specialist for assistance.


Don’t let anything pollute the air within your house. To prevent an unpleasant odor and preserve the effectiveness of your air conditioning system, you must select the proper size for your AC filter and routinely restore it. We advise working with a trustworthy household air filter service provider, such as Custom Filters Direct, who can give you high-quality MERV air filters to meet your needs.

5 Causes and Solutions of Bad AC Filter Smells

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