how often do uhave yur aircon cleaned?

[macsd]

Yung 2003 altis ko walang filter pero 8 years later nilagyan ko now cleaning it once a month. Ang rule talaga eh dont touch the ac system kung malamig naman pero pag humina dont use it na at pagawa mo kaagad kasi baka mas masira. Ung sakin sa denso ko pinagawa di nasira evaporator mahal pero sulit naman. Saka mas madali talaga dumumi pag walang filter pero ung honda fb ko na may filter every week vinavacum ko he he ung altis pwede mo nga hugasan.

Is it really true that some cars walang cabin filter? Yun di ang sabi sa akin kasi ng aircon tech on my ford escape 2007.