What will happen if you have a dirty filter in your return air duct?

Author: Landen Carter  |  Last update: Thursday, May 15, 2025

A clogged or improperly maintained filter can reduce airflow, causing your system to work harder. This can lead to higher energy bills, reduced comfort, and potential system breakdowns. With the right air filters, you can breathe easier, save money, and extend the life of your HVAC equipment.

What are the symptoms of a dirty furnace filter?

Warning Signs of a Clogged Air Filter
  • Increased Energy Consumption. When home air filters are clogged, furnaces have to work harder to meet the desired temperature of the thermostat. ...
  • Higher Electric Bills. ...
  • Uneven or Poor Heating. ...
  • Short On/Off Cycles. ...
  • Indoor Air Pollution. ...
  • Dust. ...
  • Burning Smells. ...
  • Getting Sick.

Do return ducts need to be cleaned?

cleaned simply because it seems logical that air ducts will get dirty over time and should be occasionally cleaned. Provided that the cleaning is done properly, no evidence suggests that such cleaning would be detrimental. EPA does not recommend that the air ducts be cleaned routinely, but only as needed.

What is the most immediate result of a dirty air filter?

FLAMES OR SOOTY SMOKE EXITING THE EXHAUST

Insufficient air supply to the engine results in incomplete burning of fuel. The unburnt fuel then leaves the vehicle through the exhaust pipe in the form of black smoke. This is a sign that your vehicle needs an air filter replacement or clean-up.

What sickness can you get from dirty air filter?

You or your family may experience the following symptoms from a dirty air filter or air ducts: Respiratory infections. Worsened allergies or asthma. Frequent sinus infections.

Side effects of a dirty filter | Fire & Ice Heating and Air Conditioning

How to tell if an air filter needs replacing in a house?

6 Telltale Signs It's Time to Replace Your AC Filter
  1. Accumulation of Dust Around the Air Vents. When an air filter clogs, it releases dust and dirt into the system. ...
  2. Strange Odor. ...
  3. Sudden Hike in Electricity Bills. ...
  4. Overheating AC Unit. ...
  5. Allergies. ...
  6. Malfunctioning AC.

Why is my return air vent so dirty?

Along with the air your HVAC system pushes through the ducts and vents, the air inside your home can lead to a dusty buildup — especially if your air conditioner recirculates dirt, pet fur, or other debris. This means the exterior cause of your vent's dirty situation may actually come from an interior problem.

How much does Stanley Steemer air duct cleaning cost?

The offer price is most likely per vent pricing and does not factor in the cost of the entire cleaning. While it may seem like a money-saving deal, the final price tag will probably be closer to that $450-$1000 range.

Should return air ducts be sealed?

If they are too small, airflow will be restricted and there will not be enough air circulation to heat or cool the inside of your home. Return air ducts must be sealed and unobstructed — Sealing return air ducts is just as important as sealing supply ducts.

What happens if you block the return air duct?

Reduced efficiency: Your HVAC system will work less efficiently if you block a return air vent. This will make the units use more energy and will raise your utility costs.

Where is the return vent filter located?

Air filters are commonly located between the return duct and the air handler. If you still have not found your air filter or furnace filter, look between the return duct and the air handler. The air handler is a large metal box that houses the fan and its motor.

Will my furnace shut off if filter is dirty?

If your filter becomes clogged, it can cause your furnace to shut off as a safety feature to prevent damage to the furnace. To fix this problem, simply replace your air filter on a regular basis. If you have pets, be sure to change your air filter more frequently.

What happens if you wait too long to change the air filter?

If you don't change your AC filter, it will begin to fail. It will no longer be able to filter the air properly, letting dust and contaminants get into the HVAC system. Dust jams the moving parts of an AC such as fan motors and valves. Airflow is restricted which creates a strain on the system.

How much do HVAC filters cost?

Filters with a MERV rating of 1 to 7 typically cost between $5 and $20. Filters with ratings of 8 to 13 can cost anywhere from $20 to $150. HVAC systems in residential homes usually don't need (and often cannot handle) filters with a MERV rating of more than 13.

Can I clean my air ducts myself?

Use a brush to loosen any buildup of dust in the ductwork. Lift register and insert vacuum hose as far into the piping as it can go. Turn the vacuum on to capture as much dust as possible that the fan is pushing through the ductwork.

What is a good price for air duct cleaning?

A good price for air duct cleaning services can range from $300 to $500 for a residential home. However, remember that the most important factor is not just the cost but also the quality of service provided.

How much does Servpro charge to clean air ducts?

Residential ductwork cleaning varies and can cost between $450 to $1,000. How long does it take for ductwork to be cleaned? Air duct cleaning should take less than an afternoon to perform, usually around two to four hours. However, the size and complexity of your system will determine how long the cleaning takes.

What are the symptoms of a dirty air duct?

12 Signs Your Air Duct Needs Cleaning
  • Dusty Grills. The "grill" is your window into an air duct from the wall. ...
  • Mold. Mold or mildew is a sure sign that it is time for an AC cleaning. ...
  • Allergies Are Worse Than Usual. ...
  • High Energy Bill. ...
  • Poor Respiratory Health. ...
  • Poor Air Flow. ...
  • Insect Infestation. ...
  • 8. Rat Infestation.

How do I keep my return vents clean?

Use your vacuum cleaner's hose attachment to clean the return's interior and surrounding areas. Then use a soft-bristled brush to clean the grille thoroughly. Wipe down the grille with your microfiber cloth and cleaning solution before reinstalling.

Should I have a filter on my return air vent?

The filter belongs on the return side of your HVAC's furnace and AC system. It's a “must” to have one there. And if you have a return air filter of the right size that is properly installed, then there is no need for a supply vent filter.

What are the signs of a dirty air filter?

How Can You Tell if Your Air Filter Is Dirty?
  • Reduced Gas Mileage. ...
  • Strange Engine Noises. ...
  • Decreased Performance. ...
  • Check Engine Light Comes On. ...
  • Black Smoke or Flames in the Exhaust. ...
  • The Smell of Petrol in the Exhaust. ...
  • Your Engine Misses or Misfires. ...
  • Loss of Acceleration.

Can I clean my home air filter instead of replacing it?

Reusable filters can be washed and replaced. However, the disposable filters you use in your HVAC system aren't made to shed water after they get wet. The moisture the filter retains can encourage mold growth over time, and your HVAC system might spread the mold spores throughout the rest of your home.

Why is my HVAC filter getting dirty so fast?

You're leaving your thermostat fan set to ON

When you set your fan to ON, it runs 24/7. And when the air in your home circulates through your filter and AC system non-stop, it's going to pick up dirt and air contaminants at a much faster rate.

Previous article
Do gate wheels have bearings?
Next article
Is it safe to sleep with a mouse in the room?