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furnace smells bad

HVAC

The answer to 'furnace smells bad' is that a foul odor from your furnace can be caused by a variety of issues, including dirty air filters, built-up dust and debris, or even a malfunctioning component. This unpleasant smell can indicate a more serious problem that requires professional attention.

Some common causes of a bad furnace smell include a dirty air filter that needs replacement, dust and debris buildup in the furnace, a cracked heat exchanger that is leaking exhaust fumes, or a malfunctioning component like the blower motor. The smell could also be from rotting animals or pests that have found their way into the furnace.

Sources

1
ENERGY STAR• authority
2
HVAC.com• guide
3

Step-by-Step Guide

  1. 1

    Check the air filter

    Start by checking the air filter and replacing it if it's dirty or clogged. A dirty filter can restrict airflow and cause odors.

  2. 2

    Clean the furnace

    Carefully vacuum or wipe down the interior of the furnace to remove any built-up dust, debris, or pet hair that could be causing the smell.

Frequently Asked Questions

When should I call a professional for a furnace smell?

If the smell is persistent, getting stronger, or accompanied by other issues like strange noises or uneven heating, it's best to call a qualified HVAC technician to diagnose and repair the problem.

Can I fix a smelly furnace myself?

For minor issues like a dirty air filter, you may be able to resolve the smell yourself. However, for more complex problems involving the internal components of the furnace, it's generally recommended to have a professional HVAC technician perform the repairs to ensure safety and proper operation.

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