When it comes to furnace filters, the frequency of replacement depends on the thickness of the filter. A filter with a rating of 1 can last between 1-2 months, while a filter with a rating of 5 can last up to 18 months, depending on usage. Generally, it is recommended to change your furnace filter at least twice a year. If you live in an area with a mild climate and only use your furnace for a few months out of the year, you may only need to change your filter once.
On the other hand, if you live in an area with a colder climate and use your furnace more often, you may need to change your filter every two months. When choosing a furnace filter, it is important to consider the MERV rating. MERV stands for Minimum Efficiency Reporting Value and is a measure of filtration power. A higher MERV rating means that the filter will be able to capture more particles from the air, but it can also reduce airflow and cause damage to your system if it is too thick.
For example, if you choose a 4-5 inch thick filter with a high MERV rating, you may only need to replace it once or twice a year. However, if you choose a thinner filter with a lower MERV rating, you may need to replace it every 3-4 weeks. It is also important to inspect your furnace filter regularly and replace it when necessary. If you notice that your filter is becoming clogged or producing vibratory noise, it is time to replace it.
Additionally, if you recently completed any major renovations in your home, it is recommended that you replace your furnace filter right away. By replacing your furnace filter regularly, you can ensure that your HVAC system runs efficiently and extends its life span. So make sure to check your furnace filter every month and replace it when necessary.
