Het huis heeft dubbelglas en een warmtepomp.

Because huis is a het-word in Dutch. Dutch nouns are divided into two groups:

• de-words
• het-words

Huis belongs to the het group, so the definite article is het: het huis.

This is something you usually have to learn with each noun. In the plural, both de and het nouns take de, so it becomes de huizen.

Heeft is the third person singular form of the verb hebben (to have).

The subject here is het huis (the house), which is singular, so you use:

• ik heb
• jij/u hebt
• hij/zij/het heeft

So:

• Het huis heeft ... = The house has ...

Dutch, like English, commonly uses to have for features a house possesses.

Because dubbelglas is usually treated as an uncountable noun or material/type-of-glass noun here.

So Dutch often says:

• Het huis heeft dubbelglas.

This works like English The house has double glazing or The house has double glass, where you are talking about a feature or material, not one single countable object.

You would not normally say een dubbelglas here.

Because warmtepomp is a countable singular noun, while dubbelglas is generally uncountable in this kind of sentence.

So:

• een warmtepomp = a heat pump → one countable thing
• dubbelglas = double glazing/double glass → treated as a general feature or material

That is why the sentence has:

• dubbelglas
• en een warmtepomp

Dubbelglas is a compound noun:

• dubbel = double
• glas = glass

Dutch forms compounds very often by writing them as one word, so dubbelglas is not written as two separate words.

This is very common in Dutch. For example:

• warmtepomp
• woonkamer
• fietspad

English often uses spaces where Dutch uses one combined word.

Warmtepomp is also a compound noun:

• warmte = heat
• pomp = pump

Together: warmtepomp = heat pump

Again, Dutch normally writes this as one word, not as two separate words.

The full noun is de warmtepomp, so in the sentence you get the indefinite form een warmtepomp.

The sentence follows normal Dutch main clause word order:

• Het huis = subject
• heeft = finite verb
• dubbelglas en een warmtepomp = what the house has

So the pattern is:

Subject + finite verb + rest

This is the normal verb-second pattern in Dutch main clauses. Since the subject comes first, the verb immediately follows it:

• Het huis heeft ...

If another element came first, the verb would still stay in second position.

Yes, that is also possible.

Both of these are natural:

• Het huis heeft dubbelglas en een warmtepomp.
• Het huis heeft een warmtepomp en dubbelglas.

The difference is mostly about order and emphasis, not grammar. Speakers may put the items in whichever order feels more natural in context.

Because Dutch, like English, normally does not use a comma before en when simply joining two items in a list:

• dubbelglas en een warmtepomp

A comma would only appear in special cases, not in a simple two-item combination like this.

A rough guide:

• het → sounds a bit like hut, but shorter and weaker in normal speech
• huis → roughly like house, but with a Dutch vowel quality
• heeft → roughly hayft
• dubbelglas → DUB-ul-glahs
• en → usually a short weak ən or en
• een → often reduced in speech, something like a very weak uhn
• warmtepomp → VARM-tuh-pomp (with Dutch w sounding closer to English v)

A couple of important pronunciation notes:

• Dutch ui in huis is a special Dutch sound and does not exactly match English ow.
• Dutch w is softer than English w.
• Final consonants can sound sharper in Dutch than in English.

Not usually in normal speech.

Although learners often first meet een as something like ayn, in everyday Dutch it is very often reduced and pronounced more weakly, closer to uhn or un.

So in this sentence, een warmtepomp is often said with a reduced een.

This is very normal and worth getting used to when listening.

The plurals are:

• het huis → de huizen
• de warmtepomp → de warmtepompen

Dubbelglas is usually uncountable in this meaning, so you normally would not use a regular plural in this kind of sentence.

Examples:

• De huizen hebben dubbelglas.
• De huizen hebben warmtepompen.

No. In this sentence, het is the definite article meaning the.

So:

• het huis = the house

Dutch het can also mean it in other sentences, but not here. Here it belongs to the noun huis and functions exactly like an article.