dear sifus.....i have been using panasonic airconds in my house

no matter how i vacuum my entire house which help reduce the dust tremendously....on top of the daily floor mopping and weekend walls vacuuming and fan cleaning....
the aircon filter get's clogged up within 3 weeks and some dust actually went through the standard mesh filters....as a result.....i need to get a technician to take down the indoor unit and wash it thoroughly almost like every 10 months to 1 yr

i read earlier bro kimsim proposing to put some filters on top the mesh filter....

instead of doing that, can i replace with this Honeywell Filter A Universal Carbon Pre-filter, HRF-AP1 totally?

how else can i reduce the dust level from clogging the aircon?
i've tried adding air purifiers in the room, constant vacuum cleaning

my house is pet free and no construction from neighbours...plus its not near any main road

thanks for the response.....what if i use only one single layer of filter but instead of the standard mesh, put in something like the Honeywell?
That is for air purifiers.......i got that idea since i'm using honeywell air purifier

i've even gone to the extend of installing extra window and door seals to prevent dust coming in...albeit it is not 100% reduction

hey bro....mind educating me how exactly over sizing the aircon will damage it faster....

i have 2 rooms that might be oversized....

1st room: 16'x26.5' with a 2hp aircon, no windows

2nd room: 16' x 14' with 1.5hp aircon with 8'x5' windows on 1 side of the wall

before i renovated my house, my own room used to be smaller, 10'x14' with a 1.5hp aircon....room is cold...no doubt.....
but the aircon after 2 years seems not as good....could be sign of wearing....

after reno i moved that aircon to a less utilized room....

ok......i haven't change my airconds to inverter yet....when next round aircon spoil will consider

i thought they look at the room size and the btu requirement as a basis to size the power.....

my hall and dining lagi worse...let's use this as a case study

hall is 16'x22' and the joint dining is 9' x 12'

hall contains a set of sofa comprising off 3 seater (6' wide x 2' deep x 3' high) and a single armchair measuring 3' wide x 3' high x 2' deep.
Additionally i have an upright piano, 2 IKEA Poang chairs, an aquarium measuring 2.5'x1.5'x2'

dining is straight forward, dining table and chairs.....table is 6'widex3'depthx3.5' high

i currently have a 2.5hp ceiling mounted for the main hall and a 1.5hp for the dining in case i have more people....

kitchen is closed up if the aircon is on. my main leakage is the staircase entrance where there is no doors or anything to keep the cool air....