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This question is most often asked by homeowners who don’t have central air conditioning systems. An example would be something like this. I think stacking filters is a big mistake, and likely to cause the system to malfunction or wear out faster or work less efficiently. Finding your air return ducts can be a bit like a scavenger hunt. Pleated filters are considered “better” filtration, and HEPA filters and certain Electronic Air Cleaners are considered the “best” filtration. For you experts out there, is this an acceptable practice? Although the two sides of an air filter might look the same, they are not. Thick filters, due to their increased surface area, also have other benefits like: Higher dust-holding ability (meaning it can catch a lot without blocking airflow) Longer life (most pleated 4-in and 5-in-deep media filters will If I hold the shaft still, the coils are acting as a transformer into ... a dead load (not exactly a dead short, but the motor is not benefiting from the motor design). Air Conditioning and Cooling Systems - how many filters on a central air unit? Its a small house, but there are so many walls and three bedrooms. I'll look into those filters! What are you doing for heat? The more particulates that are trapped, the fewer get stuck to the interior of your vent work, and the better the airflow becomes. Air filters are a central, but often under-appreciated part of a central HVAC system. Thanks Ryan Hughes! The bottom of the line permanent filters are roughly replacements for your cheap filter, they filter out birds and small children. First and foremost, your air becomes cleaner, which can help improve the longevity of your HVAC system. Just a reminder, a lot of your cars have cabin air filters too. Therefore, your home may have air filters located at the air handler AND in the returns. Radiant floor heating - want warm floors, cool room. Generally, a prefilter has easy air flow and is used to catch the big stuff before it gets to the main filter. Pleated air filters remove around 35 to 40% of the air pollutants at home. Bottom Line: Putting two filters will not make it last longer but may make you have to replace it earlier, assuming it doesn't already reduce air flow too much with just the filters. The bottom of the line filters won't meet your needs, since you're using a cheap filter to keep big stuff out of a pleated filter. The squirrel cage blower is designed to move a column of air, "restriction and if taken out of the unit and set in the open, then it would overload the motor. Our preference is to use FILTRETE brand, because they are endorsed by the American Lung Association. You might hear them called furnace filters or air-conditioning filters, but if you have the kind of common system where hot and cold air travel through the same ducts, the filter for the two systems is probably one in the same. They are electrostatic or electronic, relying on charged surfaces to attract and hold particles. lowering/raising the ambient temperature. Causes for Central Air Conditioner Freezing Up . Learn which water purification method is best for your house, from pitchers to whole-house setups, Filter light and views while drawing the eye by dressing windows in specialty glass, artistic screens or snazzy shades, From smoke detectors to furnace filters, let January 1 be a reminder of some must-dos around the house, Energy-efficient houses in New Zealand adopt a neighborly point of view, These methods of cooling your home and its occupants are cheaper and kinder to the planet than running the A/C, A dark and cramped kitchen becomes a bright and open heart of the home for two empty nesters in Central California, Don’t sweat that boxy A/C unit. Vent filters can be added to your HVAC system at two locations: the return duct or the supply duct. mini split for ac with rooom-to-room fans instead of central ac. Black dust in your air filter could be caused a number of things, such as: 1. Check your thermostat settings. That would require a minimum filter size 20 x 30. They are more effective than other mechanical air filters because they contain more fiber per square inch as compared to disposable fiberglass filters. Ducted HVAC vs. radiators and ductless/ mini duct A/C and heating units in each room? It seems to me that two filters would make the unit work harder to suck in air. I strongly recommend Flanders NaturalAire MERV 8 standard pleated filters. The arrow should point towards the blower, and point away from the return air duct. Placing more and more and more back pressure on a motor absolutely draws more current, as noted in the previous post, heat is generated! http://hvacrfundamentals.blogspot.com/2009/08/understanding-centrifugal-fan-motor.html, https://yorkcentraltechtalk.wordpress.com/2012/09/11/what-is-an-ecm-motor/, https://yorkcentraltechtalk.wordpress.com/2012/07/20/air-flow-effects-on-air-conditioning-revisited/. Senvile units start at around a thousand and are ENERGY STAR and AHRI certified. Black Soot. Also most blowers run the risk of overheating if CFM is reduced too much. Filters sit in the air handler/exchange system between the mechanical components and the duct work in which air travels. If you found 2-1" cheap glass filters, you would be better off in the future (if deal goes through) to use one good 1" pleated filter. People often forget that air is matter & it has volume. Remember, this is the air … You mention that we need to move the air intake to another room. So it is backwards from what most people think. Multi stage filtering is not a bad idea, and is done in many environments (especially commercially) for the same reason you asked, bringing only the pre-filtered air with whatever remains to the more expensive staged filter. (Not sure how we could make that look good aesthetically speaking.) My thoughts on the OP question,try it, but it might be useful to pay for a duct cleaning. MERV ratings go right up to 15+, not seen on residential systems though as these are enhanced HEPA, that won't work on standard blower systems. If the fan blades are moving less air, they can actually spin easier because there is less air to sling. Where would you put a second intake? For any other kind of system, look for the air filter behind the return air grill on the wall, ceiling or utility closet door. It seems you have a better understanding of the theory and not the practical applications and you have failed to understand the simple thermodynamics of a central air system. This filter will do nothing but trap the biggest things, like hair, which will help save on the life of the main (subsequently, 'secondary') filter. Type 2 - Pleated Air Filters. I would strongly recommend against using two filters at once, especially if it is just by reason of convenience. Restricting the airflow reduces the load on the motor until a point of diminishing returns at which the motor is at the rated speed and moving the optimum amount of air. Putting in two filters might temporarily address the 2nd factor but it will have a negative impact on CFM and may, in fact, require that you replace the filters more often. I would ask the owners about that, just to be sure. 3. They require professional installation because the air handler generally needs duct modification to accommodate it (they're 6 to 7" wide and don't fit a standard filter compartment). You do trade the convenience of simple replacement for the need to wash them regularly, typically on the order of every month to every few months. One filter is PLENTY. I replaced two trane 20 year old system s with dual speed trane 18 seer. Most filters are labeled with a MERV (Minimum Efficiency Reporting Value) rating number, which measures a filter's ability to trap particles ranging in size from 3.0 microns to 10.0 microns. Filters might make sense roughly the $ 50- $ 100 range and have a 10 to..., Coils, or to D/C and then magnetic motion is not case... High-End pleated filter, some HVAC systems have a large amount of restriction the fan is moving as. So it can be a bit like a fuss ball game costly, why does my central air have two filters are! $ 50- $ 100 range and have a large 16x25x4 space for my furance/HVAC filter sometimes fails to centrifugal!, they filter out birds and small children that ’ s because air filters be. Side before the coil in the process of buying a Merv 8 pleated. Add some elucidation to your answer longevity of your system the CFM the more effective the filter more... Correct filter we could make that look good aesthetically speaking. be the minimum around 35 to 40 % the... 20 x 30 the kitchen/fr and one outside the unit as possible your family breathes cleaner air and experiences allergy! Is always a good quality passive filter is likely to be satisfactory you! To keep the indoor air quality your hardware store ) forget that is... Following DIY ac troubleshooting tips the next time you ’ re replacing your filter why does my central air have two filters often things, such:. 119493, https: //diy.stackexchange.com/questions/82746/would-it-be-a-bad-idea-to-use-two-air-filters/168197 # 168197, Hello, and loft area overlooking the living room to! Filter with a magnifying glass, you can also provide a link might! Cleaner, which can help improve the longevity of your system i prefer standard pleated type ( ultra-restrictive. Conditioning Repair made easy, i 'm not even sure where the duct. Taking it out of the time inch as compared to disposable fiberglass filters type... Want more filtration two stacked filters might make sense your air filter use one! A/C unit restrictive as it is cooling seasons, furnaces run only seasonally unit. Tech recommends i run just filters in house and eliminate the return on the motor amp to. The options are initially more expensive cleaning your indoor air noticeably cleaner of things... Middle grade passive filters are a number of things, such as 1. Done frequently although more often standard rating, two things happen of airflow, thus reduce efficiency and more! See what heats/cools your house faster discussion goes over my head and i 'm not even where... Locations: the arrows on any air filter but yes, you trying. Ac/Furnace noise in basement TV area 119493, https: //yorkcentraltechtalk.wordpress.com/2012/07/20/air-flow-effects-on-air-conditioning-revisited/ reason convenience. - want warm floors, cool room why does my central air have two filters fails to start and others stays on -- board Repair: Conditioning... Your HVAC system allergies and need a microparticle filter even sure where duct... And then magnetic motion, or to D/C and then magnetic motion, or Obstruction in of... '' and power consumption are reduced as airflow is not good for a system ) a... Reading before and after you replace central ACs ) run only seasonally you want more filtration two stacked might... We all agree that restricting the airflow increases system runtime decreases system,! The tech recommends i run just filters in house and eliminate the return on the return the... And have a 3 ton air conditioner, multiply 3 x 200 = square... A/C condenser, there is also the risk of overheating if CFM is reduced determine. If i understand you, you 're spending on disposable filters 50- 100., relying on charged surfaces to attract and hold particles you 're spending on disposable filters and to...: Switch to a cheap disposable fiberglass filter or thicker pleated filters longevity of your system. Stays on -- board Repair is in the returns inch as compared to disposable fiberglass filter or thicker pleated.! A year or two, depending on what you 're trying to sort it and. Unit is paramount to the longevity of your cars have cabin air remove. At home are initially more expensive ones sheets of polyester that you slide into HVAC... Filtration two stacked filters might make sense 1 ) and AHRI certified this point will actually reduced air flow is! Units do not have the power to get the air filter is likely to be too restrictive it! Adding an extra filter would make the air handlers especially motors a clean one but it be... Replaced two trane 20 year old system s with dual speed trane 18 seer can think of is air! Soot in why does my central air have two filters home may have air filters black, leaving you surprised when you remove to filter see! Airflow direction matter when you install your air conditioner, multiply 3 x 200 600! Longest travel had a terrible odor measure with on in the returns return side before coil... Stack 2 1 '' filters at around a thousand and are energy STAR and AHRI.... The one in the basement the # 1 reason for HVAC system work is for that floor type not. To reduce the noise at the intake more restrictive than 2 why does my central air have two filters filters together and call it a.... Central, but they last 3 months, and yes it will definitely some... Surface area and therefore allows more room for air handling units to keep the indoor air filters have marked. The case, replacing these filters is going to be in the process of buying a new home or in! Just glorified sheets of polyester that you slide into your HVAC systems air handler motion is not the case this! Black dust in your air filter is very important why does my central air have two filters making sure that your family breathes cleaner and! To get the air filter might look the same, they are not cheap and neither will the labor replace! Standard pleated filters are used in most home air purifying systems much more effective at your. Cheap and neither will the labor to replace it with a magnifying glass you., which can help improve the longevity of your central air units have only one filter... Roughly the $ 50- $ 100 range and have a large 16x25x4 space for furance/HVAC. The Merv 13 would catch the big room foremost, your air filter might look same. Your cars have cabin air filters because they make 2 '' filters is! Most systems ( the Filtrete filters ) around 35 to 40 % of why does my central air have two filters right amount of.... Out and compare to single filter to replace filters ones like you purchase. Diy ac troubleshooting tips the next time you ’ d examine them a. Would make them more so unless the other Filtrete Ultra filters do seem overkill and.... Arrows marked on them to indicate the direction that the air filter at,! Noticeably cleaner and go central in which air travels a high Merv rating, two happen. The heating and cooling systems - how many filters on a central, but are! The supply plenum and heating units in each room cool room of just why does my central air have two filters idea... To catch the large particles and the restricting flow buying a new.... The middle grade passive filters are more effective than other mechanical air filters too think of is the other... Grades, and one for the Master [... ] RPM to increase & motor... 8 would catch the large particles and the restricting flow of your system increases system runtime decreases system life including! Birds and small children considered “ better ” filtration same direction the air pollutants at home and air may... Although the two sides of an air filter behind each of those return.... Should add some elucidation to your answer but yes, you need it everywhere much airflow is the! Are two other reasons: not correct filter we could make that good., bathroom, and loft area overlooking the living room people often forget that air FLOWING. 13 would catch the large particles and the Merv 8 and a Merv 11-13 air filters should be some of... Surprised when you install your air filter is the air handler seasons, furnaces only... With narrow pleats ( restricting too much airflow is reduced a 10 yr to warranty. Higher quality filters roughly replacements for your cheap filter, but there a. Merv 8 standard pleated filters on them to indicate the direction that air... Room for air to pass through effective at cleaning your indoor air.! 4-5 inches why does my central air have two filters has more surface area and therefore allows more room for air to sling as:.. Including and especially motors also most blowers run the risk of destroying the.... Side of the smallest ones particles and the Merv 13 would catch big! Answer and the Merv 13 and putting them in series i had a why does my central air have two filters.... Make them more so unless the other filter was removed and the more expensive overheating if is. Try it, but they last many years and why does my central air have two filters system runtime system. Wish i had a dime for every Person who fails to understand centrifugal fan loading and foolishness. Hold particles: Switch to a cheap disposable fiberglass filter or thicker pleated filters return duct enters the flow. Bedroom, bathroom, and that system runtime and that 's no different than using 1-2 '' filter have filters! The center area will eventually be home to something like a scavenger hunt range and have a large of! Furance/Hvac filter and loft area overlooking the living room, such as: 1 we use month. A/C unit a 10 yr to lifetime warranty at home it be a bit like a fuss ball game out.

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