العزل الحراري في الحائط قرب النافذة المزدوجة الزجاج.

Not really. As written, it sounds more like a phrase, caption, or diagram label than a full sentence.

It is basically naming a location or feature:

• العزل الحراري = thermal insulation
• في الحائط = in the wall
• قرب النافذة المزدوجة الزجاج = near the double-glazed window

Arabic often uses short verbless phrases like this in technical descriptions.

If you wanted a full sentence, you could say for example:

• يوجد العزل الحراري في الحائط قرب النافذة المزدوجة الزجاج.
• العزل الحراري موجود في الحائط قرب النافذة المزدوجة الزجاج.

Because in Arabic, adjectives usually come after the noun they describe.

So:

• العزل الحراري = literally the insulation thermal
• النافذة المزدوجة = literally the window double/doubled

This is normal Arabic word order for noun + adjective.

English does the opposite:

• thermal insulation
• double window / double-glazed window

In Arabic, an adjective must usually match the noun it describes in:

• definiteness
• gender
• number
• and, in fully vowelled Arabic, case

So if the noun is definite with الـ, the adjective is also definite:

• العزل الحراري = the thermal insulation
• النافذة المزدوجة = the double window / the double-glazed window

If the noun were indefinite, the adjective would also be indefinite:

• عزل حراري
• نافذة مزدوجة

This agreement is one of the most important patterns in Arabic grammar.

It is a noun + adjective combination meaning thermal insulation.

Breakdown:

• العزل = insulation, isolation
• الحراري = thermal, heat-related

الحراري is an adjective related to heat. It is the kind of adjective Arabic often forms to mean -al, -ic, or related to something.

So:

• حرارة = heat
• حراري = thermal

في means in or inside, while على means on.

So:

• في الحائط suggests the insulation is inside the wall or within the wall structure
• على الحائط would mean on the wall surface

For insulation, في الحائط makes good sense if the material is built into the wall.

Also, حائط means wall. Another very common word is جدار. In many contexts, both work, though جدار can sound a bit more neutral in Modern Standard Arabic.

قرب means near or close to.

In this phrase:

• قرب النافذة = near the window

Grammatically, قرب is originally a noun meaning nearness/proximity, but it is very often used like a preposition in expressions of place.

A very common alternative is:

• بالقرب من النافذة = near the window

So these are close in meaning:

• قرب النافذة
• بالقرب من النافذة

The version in your sentence is a bit shorter and more compact.

Because النافذة is a feminine singular noun, so the adjective must also be feminine singular.

• نافذة = window, feminine
• مزدوجة = double, doubled, dual-layered, feminine form

If the noun were masculine, you would use مزدوج:

• الباب المزدوج = the double door

This is basic adjective agreement in Arabic.

Because الزجاج is not another adjective describing النافذة directly. It is the noun glass, and it tells you what is doubled.

So the idea is:

• المزدوجة الزجاج = double in glass, meaning double-glazed

This is similar to patterns like:

• طويل القامة = tall in stature
• خفيف الوزن = light in weight

So here:

• المزدوجة agrees with النافذة
• الزجاج specifies the thing involved: glass

That said, many learners will also encounter clearer alternatives such as:

• النافذة ذات الزجاج المزدوج
• نافذة مزدوجة الزجاج

Those may feel more transparent at first. The phrase you were given is understandable, but those alternatives are often easier for learners to parse.

Not every الـ is pronounced the same way. Arabic has sun letters and moon letters.

In this sentence:

• العزل → al-ʿazl
• الحراري → al-ḥarārī
• الحائط → al-ḥāʾiṭ
• النافذة → an-nāfiḏa
  because ن is a sun letter
• المزدوجة → al-muzdawija
• الزجاج → az-zujāj
  because ز is a sun letter

So the l sound of الـ disappears before sun letters like ن and ز, but it stays before moon letters like ح and م.

Because ordinary Arabic writing usually leaves them out.

So the text appears as:

• العزل الحراري في الحائط قرب النافذة المزدوجة الزجاج

But in fully vowelled formal Arabic, some words would show case endings or other short vowels. For example:

• في الحائطِ
• قربَ النافذةِ

Most real-world Modern Standard Arabic is written without those endings, and native readers understand them from context.

For learners, this means you often have to learn:

1. the basic dictionary form of a word
2. the grammar pattern
3. the pronunciation from context rather than from spelling alone