التكييف والتدفئة ما عادوا يشتغلوا.

In this sentence, ما عادوا means they no longer or they don’t ... anymore.

So:

• ما عادوا يشتغلوا = they no longer work
• not they didn’t return to work

On its own, عاد can mean returned or became again, but in Levantine ما عاد + verb is a very common pattern meaning no longer / not anymore.

Because the subject is التكييف والتدفئة — two things joined by و (and).

In Levantine, when the subject is a pair like this, the verb usually agrees in the plural. So both verbs show plural agreement:

• عادوا
• يشتغلوا

That may feel repetitive to an English speaker, but it is normal in Arabic for verbs to show agreement even when the subject is clearly stated.

Because the Arabic dual is usually used for two of the same noun, not for two different nouns joined by and.

For example:

• كتابين = two books
• بابين = two doors

But here we have two different items:

• التكييف = the air conditioning
• التدفئة = the heating

So Arabic treats them as a coordinated plural group, not as one dual noun.

Because the two nouns are mixed:

• التكييف is grammatically masculine
• التدفئة is grammatically feminine

When Arabic has a mixed group, masculine plural is the default agreement. So عادوا and يشتغلوا appear in the masculine plural.

That is very normal.

Here يشتغلوا means to work / function / run for a machine or system.

So in this sentence it means:

• the AC and heating aren’t functioning anymore
• they don’t run anymore

The verb اشتغل / يشتغل can be used for:

• people: to work
• machines/devices/systems: to work, function, run

So the meaning depends on the subject.

That is a very common learner question.

In Levantine, the present tense often uses بـ, but after ما عاد many speakers use the bare imperfect, especially when meaning no longer.

So ما عادوا يشتغلوا is completely natural.

You may also hear forms with بـ in some dialects or from some speakers, but the version without بـ is very common in this structure.

Because both nouns are definite:

• التكييف = the air conditioning
• التدفئة = the heating

In Arabic, when two definite nouns are joined by و, each one normally keeps its own الـ.

So التكييف والتدفئة is the normal way to say the air conditioning and the heating.

A rough Levantine pronunciation would be:

et-takyiif w et-tadfiye ma ʿaadu yeshteghlu

A few notes:

• ال assimilates before ت, so
  التكييف sounds like et-takyiif, not al-takyiif
• التدفئة similarly sounds like et-tadfiye
• يشتغلوا is often pronounced something like yeshteghlu

Exact pronunciation varies a bit by region.

Yes, this sounds clearly Levantine.

Two strong clues are:

• ما عاد for no longer
• يشتغلوا as a colloquial verb form

A more formal Arabic version would usually use something more like لم يعد ... يعمل rather than ما عاد ... يشتغل.

So this sentence is very natural for spoken Levantine, not formal written Arabic.

Literally, it means they don’t work anymore / they no longer work.

But in natural English, depending on context, you might also translate it as:

• The AC and heating stopped working
• The AC and heating aren’t working anymore

The Levantine sentence mainly describes the current state: now they are not functioning.

Yes. A few common alternatives are:

• التكييف والتدفئة ما عادوا شغّالين
  = the AC and heating aren’t working anymore

• التكييف والتدفئة خربانين
  = the AC and heating are broken

The original sentence with يشتغلوا focuses on functioning / running, while خربانين more strongly suggests that they are actually broken.