How long should a furnace filter last?

For example, a one inch furnace filter should be changed out every one to three months. A three to four-inch filter can last for six to nine months. If you have a thick five to six-inch filter, it can last from nine to twelve months.

How often do furnace filters need to be replaced?

In general, this is how often changing furnace filters needs to be done: For 1- to 2-inch filters, replace them every 1 to 3 months. For 3- to 4-inch filters, replace them every 6 to 9 months. For 5- to 6-inch filters, replace them every 9 to 12 months.

Do furnace filters really last 3 months?

To keep your air quality under control and your home clean, you’ll want to replace your filter at a minimal interval of every 2-3 months.

Why does my furnace filter get dirty so quickly?

Leaky Duct Work

According to ENERGY STAR, a typical house loses 20-30% of air through leaks in the duct work and poor duct connections. Leaving these untreated can not only kill your furnace filter quickly, but also result in higher energy bills.

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Why is my furnace filter so dirty every month?

Your filter gets clogged faster when your furnace is running more often. That’s because more air is cycled through your filter when your furnace goes through more heating cycles, so more contaminants get caught on the filter’s media. … That’s why it’s extra important to check on your filter every month during winter.

How do I know if my furnace filter is dirty?

What Are the Symptoms of a Dirty Air Filter?

  1. Filter is a different color. …
  2. Energy bills are higher than usual. …
  3. Low air flow. …
  4. Rise in physical issues. …
  5. Headaches. …
  6. Allergies. …
  7. Carbon monoxide poisoning. …
  8. Forces HVAC systems to work harder.

What happens if you don’t change your furnace filter?

Short Cycling

If the air filter is not serviced often enough, it will eventually become clogged to the point that air cannot pass through it. When the furnace is operating, the lack of air flow will trap the heat in the system. … Without a new air filter, the furnace will overheat every time it starts up again.

How much does a furnace filter cost?

Although flat filter designs offer the most savings upfront, they need to be replaced more frequently and may cost you more in the long run. Replacing these filters can cost anywhere from $40 to $200 a year.

Do you change furnace filters in summer?

The same HVAC system that moves air throughout your home during the winter, will be moving the air throughout your home in the summer. … Frequent filter changes will help to increase the lifespan of your entire HVAC system. So, yes, your furnace filter needs to be changed even in the summer.

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Are expensive furnace filters necessary?

Furnace filters not only prevent the system from getting clogged up with dust and debris but also clean the air in your home. As they are essential to the system’s function, they must be maintained and kept clean.

Cheap Vs. Expensive Furnace Filters.

Cheap Filters Expensive Filters
Better airflow Denser material restricts airflow

Is no air filter better than a dirty one?

Running your air conditioner without a filter is worse than running it with a dirty one. Instead, get to the store as soon as possible for a replacement or call an HVAC professional for replacement. Without a filter, your air conditioner is at risk for severe and expensive problems.

How often should you change your furnace filter in the winter?

Professionals, like our team at Airco Service, Inc. say that you should change your air filter at least every three months. During the winter, when you rely on your heating system more, you want to increase that frequency. During the winter, when the system is in constant use, change it out every month.

Which filter typically gets clogged quickly?

5 Reasons Air Filters Clog Up Faster Than Usual

So when it’s hotter or colder than usual outside and your system is running frequently, your air filter will clog up faster because there is more air that’s being sent through it.

Why are my furnace filters black?

If the dirt collected in the furnace is left wet for an extended period, sooty mold can develop and later spread to the furnace filter. Many of the central heating systems that are not cleaned regularly have grown mold, which causes the filter to have a black color.

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Why is my furnace filter gray?

Lots of Dirt and Soot

An air filter collects dirt, dust and other impurities. Look for the filter to turn dark gray as it catches a lot of these things. … Eventually, they reach the furnace’s filter. Residue made inside the furnace might result from a mechanical or other problem.