لو شغلنا المكيف من الصبح، ما كانت الغرفة صارت حارة كتير.

This is a past unreal / counterfactual conditional.

In other words, the speaker is talking about something that did not happen, and is imagining a different result. In Levantine, that is very often done with لو plus a past verb.

So the pattern here is basically:

• لو + past verb = if ... had ...
• result clause with كان
  • past expression = would have ...

Because لو is the normal choice for an unreal or hypothetical situation, especially about the past.

• لو = if in a hypothetical / contrary-to-fact sense
• إذا = if/when for something real, expected, repeated, or possible

So here, the speaker is not talking about a real future possibility. They are saying something like: If we had turned on the AC earlier... That is why لو fits.

After لو, Levantine often uses the past/perfect form to talk about a past hypothetical situation.

So شغلنا is literally a past form, but in this context it means:

• we turned on
• or, more naturally in English here, we had turned on

This is very normal in Arabic conditional sentences of this type.

Here شغلنا comes from شغّل and means we turned on / we started / we ran.

With appliances and machines, شغّل very often means to turn on:

• شغّل المكيف = turn on the AC
• شغّل التلفزيون = turn on the TV

So in this sentence, it definitely means turned on the air conditioner, not worked in the sense of doing a job.

Literally, من الصبح means from the morning.

In natural English, depending on context, it can mean:

• since the morning
• from early morning
• in the morning / starting in the morning

In this sentence, the idea is from early in the day, not just at one exact moment.

This is one of the key things learners notice.

In Levantine, كان is often used to build meanings like would or would have in conditional sentences. Then another verb can follow it.

So:

• كانت ... صارت here is functioning like would have become
• ما كانت ... صارت = would not have become

Arabic does not need a separate word exactly like English would have. Instead, it often uses كان plus another past form to express that idea.

Because the subject is الغرفة (the room), and غرفة is a feminine singular noun.

So the grammar matches that noun:

• كانت = feminine singular
• صارت = feminine singular
• حارة = feminine singular adjective

This agreement is completely normal in Arabic.

Here صار means became or got.

So:

• صارت حارة = it became hot / it got hot

This is a very common Levantine use of صار. It often describes a change of state:

• صار تعبان = he got tired
• صارت باردة = it became cold

So in this sentence, the room became hot.

Yes, Arabic word order is flexible, and this can confuse English speakers.

Here, the order is:

• ما كانت
• الغرفة
• صارت حارة كتير

That is normal. The subject الغرفة appears after كانت.

You may also hear slightly different word orders in speech, such as:

• ما كانت صارت الغرفة حارة كتير

Both are understandable. Levantine often allows this kind of variation more freely than English.

Because ما is the normal negator for verbs in Levantine.

Here the speaker is negating a verbal idea: كانت صارت (would have become), so ما is used:

• ما كانت ... صارت

By contrast, مو is more commonly used with nouns, adjectives, or identification:

• مو أنا = not me
• مو حلو = not nice

So in this sentence, ما is the right choice.

Because in Levantine, كتير often comes after adjectives to mean very.

So:

• حارة كتير = very hot
• حلو كتير = very nice
• صعب كتير = very difficult

This post-adjective position is very common in colloquial speech. It may feel backwards to an English speaker, but it is a normal Levantine pattern.

Yes, absolutely.

• لو شغلنا المكيف...
• لو كنا شغلنا المكيف...

Both can work.

The version with كنا makes the past-before-past feeling more explicit, a bit like stressing had turned on in English. But in everyday Levantine, speakers very often just say لو شغلنا and let the conditional context do the work.

So the shorter version in your sentence is very natural.