How Often Should I Replace My Air Filter?

HVAC-Air-Filter

Learn How Often You Should Replace Your HVAC Air Filter

Air filters are a critical piece of equipment used to protect your HVAC system, keep it running smoothly, and help with clean airflow in your home.  Because it is out of sight, many homeowners neglect to replace their air filters (commonly called furnace filters) in a timely manner.  If your system is using a filter well past its prime it can cause your heating and cooling equipment to work harder than necessary.  A furnace filter that has dust and dirt preventing the flow of air will cause your system to overexert itself in its efforts to achieve your set temperature.  This straining of your system to produce appropriate air temperature can cause three problems.  First, it lowers the efficiency of your system as it works harder to overcompensate and in-turn, increases your utility bill.  Second, it could cause greater damage to your system (freezing coils, liquid slugging of your air compressor or heat pump). Third, it reduces the clean out-put of air throughout your home.  With the humidity levels we all experience in Hampton Roads, an unchanged air filter can be a breeding ground for bacteria and mold.

The replacement timeline for your filter depends on a couple of factors.

What type of filter are you using?

The low-cost fiberglass filters should be changed every 30 days.  The pleated more expensive filters can last up to 6 months.  A good rule of thumb is to replace pleated filters every 90 days.  If you have electrostatic or washable filters, they should be washed, dried, and re-installed once a month.  The washable filters are more eco-friendly and, if cleaned and reused appropriately, can last 5 to 10 years.

Who is in the home?

If there are allergy or asthma sufferers in your home then filters should be replaced more frequently – a minimum of every 6 weeks.

If you have shedding pets such as cats or dogs in your home then filters should be replaced more frequently – minimum of every 2 months.  When the seasons change cats and dogs are more likely to have greater shedding.  When winter turns to spring and when summer turns to fall are two key periods to change your filter if you have a shedding pet in the home.

Is it time yet?

Remembering to actually change your filter is one of the biggest hurdles.  You can always add it to your calendar, just like all the other appointments in your life.  A great trick is to right the date on the border of your filter when it is installed so that you will know at a glance how long it has been in use.  If you do not have a clue as to the last time your air filter was changed, give it a quick eye test.  If you see a subtle layer of dirt on the filter and the filter’s material is somewhat visible beneath then it is still fine.  When it goes past that point – the layer of dust or dirt coating is covering most of your filter’s surface and the filter material is obscured, then it is time for a replacement.

Consider enrolling in Smith & Keene’s Signature Service program to help keep an eye on the efficiency of your home’s heating and cooling equipment.

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Smith & Keene has been serving the people and businesses of Hampton Roads since 1947. We’ve been in business for 70 years, because we put quality service and our customers’ comfort first. Whether you need HVAC, electrical or plumbing services, our qualified technicians and support staff are committed to the pursuit of excellence. Call us today to find out how our second and third generation family business can help your family or business.
It's a Matter of Trust. It's a Matter of Commitment. It's the Pursuit of Excellence.
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