How often should you change filter in home air conditioner?

My a/c tech says twice a year. Fall, so you're ready for heating season and Spring so you're ready for cooling season. Those are the 2 times a year he comes to change ours and we have the special allergy system.
How often should you change filter in home air conditioner?
Clean monthly my window units.
How often should you change filter in home air conditioner?
I own an A/C company and I change mine every month. They are a dollar each, whats the issue ?
Every 2 months, for people with allergies, personally I don't change mine but once every like 3-4 months
Every 2 months is sufficient. My husband is an air conditioning/heating service man for 5 yrs. Leaving a filter gooked up with junk doesnt allow your system to circulate properly...and your breathing all that junk it. It goes into your duct work.
every month, %26amp; clean the outside housing.
how often do change any filter. conditions vary. the best way is to plan and simply check it once a month then you can determine your conditions for replacement. if you live in a dusty area check it more often. opinions vary so eyeball it.