Kama kiyoyozi kingekuwa kimewashwa mapema, chumba kisingekuwa cha joto sana.

Kama introduces the condition and means if.

So the sentence has this basic shape:

• Kama ... = If ...
• ..., chumba kisingekuwa ... = ..., the room would not have been ...

It is the normal, very common way to begin an if-clause in Swahili.

Swahili shows this mainly with the -nge- marker, which is used for hypothetical or contrary-to-fact situations.

Here you see:

• kingekuwa
• kisingekuwa

The -nge- part signals would / would have / had ... would ... type meaning, depending on context.

So:

• kiyoyozi kingekuwa kimewashwa mapema = if the air conditioner had been turned on earlier
• chumba kisingekuwa cha joto sana = the room would not have been so hot

A useful shortcut is:

• -nge- = hypothetical / counterfactual
• with the rest of the sentence, it often becomes an English had ... would have ... structure

Because both nouns belong to the same noun class: class 7 in the singular.

• kiyoyozi = air conditioner
• chumba = room

Since both are class 7 singular nouns, the sentence uses class 7 agreement:

• ki-nge-kuwa
• ki-si-nge-kuwa
• ki-me-washwa
• cha joto

So even though the nouns mean very different things, they behave similarly in grammar because they are in the same noun class.

If they were plural, you would usually see vi- instead:

• viyoyozi
• vyumba

Kingekuwa can be broken down like this:

• ki- = subject marker for a class 7 singular noun
• -nge- = hypothetical / conditional marker
• -kuwa = be

So kingekuwa means something like:

• it would be
• or, in this kind of sentence, it would have been

Because the subject is kiyoyozi, the ki- refers to the air conditioner.

Kisingekuwa is the negative version of kingekuwa.

It can be broken down like this:

• ki- = class 7 singular subject marker
• -si- = negative
• -nge- = hypothetical / conditional
• -kuwa = be

So kisingekuwa means:

• it would not be
• or in this context, it would not have been

Because the subject here is chumba, the whole form means the room would not have been.

Kimewashwa means it has been switched on / it is in the state of having been switched on.

A helpful breakdown is:

• ki- = class 7 singular subject marker
• -me- = perfect marker
• -wash- = verb root from kuwasha = switch on, turn on, light
• -w- = passive
• -a = final vowel

So:

• kuwasha = to switch on
• kuwashwa = to be switched on
• kimewashwa = it has been switched on

One important note: -washa in Swahili is a normal verb meaning switch on / light, and it is not related to the English verb wash, even though it looks similar.

This combination helps express a more complete idea like would have been turned on or, in the full if-clause, had been turned on.

Think of it this way:

• kingekuwa gives the hypothetical frame: it would have been
• kimewashwa gives the resulting state: switched on

Together:

• kingekuwa kimewashwa = it would have been in the state of having been switched on
• natural English: it had been turned on / it would have been turned on, depending on the full sentence

This kind of combination is common in Swahili when expressing a state resulting from a completed action.

Because Swahili often uses an agreeing connector before a noun that expresses a quality or characteristic.

Here:

• cha agrees with chumba (class 7 singular)
• joto literally means heat
• cha joto literally means of heat
• idiomatically: hot / warm

So:

• chumba kisingekuwa cha joto sana = the room would not have been very hot / so hot

The cha is important because it links the noun chumba with the quality expressed by joto.

Sana literally means very, a lot, or greatly.

So:

• cha joto sana literally = very hot / of much heat

In English, though, when we translate this kind of counterfactual sentence, we often naturally say:

• wouldn't have been so hot

That so is just better English in this context. But the Swahili word itself is still sana, whose core meaning is very.

Mapema means early / earlier. Here it modifies the idea of being turned on.

So:

• kimewashwa mapema = turned on earlier

Placing mapema after the verb phrase is very natural. It can sometimes be moved for emphasis, but the position used here is simple and standard.

So this sentence’s wording is a very normal way to say turned on earlier.

No. Swahili normally does not use articles like English the and a/an.

So:

• kiyoyozi can mean an air conditioner or the air conditioner
• chumba can mean a room or the room

You figure out which one is meant from context. In this sentence, English naturally uses the air conditioner and the room, but Swahili does not need separate words for that.