Tip & How-To about Heating & Cooling

The importance of changeing your Return air filter

Hi, This is for all of you people out their that own central heat and air systems, or any Heating and Air Conditioning unit that has a filter. What happens when a filter gets dirty to the point of caving in, this can and will cause severe problems with you're unit. The number one problem is, it will cause ice build up on the evaporator coil as dirt does filter past a clogged filter and build up on the evaporator coil.Some package units are fairly easy to clean, but most you can't get to unless a square section of sheet metal is removed to excess the return side, or back side of the evaporator coil. This is done on roof top units the majority of the time. When a dirty filter is clogged, you will notice very little air flow coming from your vents due to the filter and ice. The air can't get past this ice to cool the house or heat if it is plugged.To call a service tech out to deal with a dirty evaporator coil can, and will be very costly indeed. I do this for a living and am a contractor in this field, and I see this problem everyday. Good for me, but bad for you.So please, change filters monthly if you live in a dusty area and quarterly if not. I am trying to save you those hard earned $$$$$!!! If you have the washable type, wash them.This can lead to very serious problems, as a lot of customers have no idea they even have a filter! So please keep this in mind, change it often, and prevent this problem. If you have little ones in your home, elderly folks with breathing problems, this will help so very much. You can buy the filters that are rated to 95 % up to 99.5% dust free as in a Hep-pa filter as used in hospitals. Yes you will pay more, but whats a life worth when it comes to someone you love that lives with breathing problems? You can't replace this and can't put a dollar amount on a life! I sincerely Hope this has been helpful to all of you out there.

PS Dirty filters effect blower motors and other internal parts, as well as not keeping you're air clean that you breath.You can purchase pleated filter which are much better then the $1.00 ones.You get what you pay for.

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3 Answers

My A/C blowing air, but it is not cool. It has started freezing up. We just replaced the air filters and since then it is freezing up. We even gently cleaned the a/c coils before replacing the filters. Is there something else we can clean before we call a repairman? We have an Intertherm Central Air Unit.

Hello, sounds like it is either a low charge or lack of airflow, what type of filter are you using? sometimes those filters that claim to be super effecient will actually cut down on your airflow and cause the ac to freeze up.

Jul 15, 2011 | Intertherm Heating & Cooling

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Boiler doesn't fire up. 25 years old Amana outdoor boiler model #3612M-A Mfg # P68191-1F,It had leak in pump housing and replaced, replaced igniter ,but no fire, no leak in system ,pump are keep running How to remove air from system and why it doesn't fire up , like to have step by step diagnosis chart Thank you.

How a Central Air Conditioning System Works

  • The typical central air conditioning system is a split system, with an outdoor air conditioning, or "compressor bearing unit" and an indoor coil, which is usually installed on top of the furnace in the home.
  • Using electricity as its power source, the compressor pumps refrigerant through the system to gather heat and moisture from indoors and remove it from the home.
  • Heat and moisture are removed from the home when warm air from inside the home is blown over the cooled indoor coil. The heat in the air transfers to the coil, thereby "cooling" the air.
  • The heat that has transferred to the coil is then "pumped" to the exterior of the home, while the cooled air is pumped back inside, helping to maintain a comfortable indoor temperature.
  • Central air conditioning can also be provided through a package unit or a heat pump.

  • Indoor comfort during warm weather - Central air conditioning helps keep your home cool and reduces humidity levels.
  • Cleaner air - As your central air conditioning system draws air out of various rooms in the house through return air ducts, the air is pulled through an air filter, which removes airborne particles such as dust and lint. Sophisticated filters may remove microscopic pollutants, as well. The filtered air is then routed to air supply ductwork that carries it back to rooms.
  • Quieter operation - Because the compressor bearing unit is located outside the home, the indoor noise level from its operation is much lower than that of a free-standing air conditioning unit.


Sep 10, 2008 | Amana Heating & Cooling

1 Answer

is there any filters to change for air conditioning

Yes, there should always be filters in your heating and air conditioning system. Assuming you are asking about a central heat and air system for a home or business, the filters will be located in the return section, basically where ever the air flow is getting sucked back into the system. More updated systems will have the filter in a filter grill inside the home or business, while older systems can have them inside the unit itself, usually above the unit inside. Hope this helps with what you were asking for, if you needed info on another type of system, feel free to ask. Good luck!

Jul 03, 2011 | Heating & Cooling

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