Hideget érzünk a házban.

Because hideget is the accusative form of hideg.

In this sentence, érez (to feel) takes a direct object, and the thing being felt is hideg (cold), so it becomes hideget.

• hideg = cold
• hideget = cold, as the object of the verb

So Hideget érzünk literally means We feel cold.

Hungarian often treats sensations like this differently from English.

In English, cold is just an adjective in we feel cold.
In Hungarian, the idea is more like we feel coldness, so hideg behaves like a noun-like object and takes the accusative ending.

That is why you get:

• Hideget érzünk = We feel cold

This is natural Hungarian usage, even though it does not match English word-for-word.

Érzünk means we feel.

It comes from the verb érez = to feel.

The ending -ünk shows:

• we
• present tense

So:

• érzek = I feel
• érzel = you feel
• érez = he/she/it feels
• érzünk = we feel

Hungarian usually does not need a separate word for we, because the verb ending already shows the subject.

Because Hungarian verb endings usually already show the subject.

In érzünk, the ending -ünk tells you the subject is we. So adding mi (we) is usually unnecessary unless you want emphasis.

• Hideget érzünk a házban. = We feel cold in the house.
• Mi hideget érzünk a házban. = We feel cold in the house.
  This sounds more emphatic, like we specifically.

A házban means in the house.

Breakdown:

• a = the
• ház = house
• -ban / -ben = in

So:

• házban = in a/the house

The suffix -ban is used because Hungarian usually expresses in with a case ending instead of a separate preposition.

Hungarian vowel harmony determines which version of the suffix you use.

• -ban is used after words with mostly back vowels
• -ben is used after words with mostly front vowels

Since ház contains the back vowel á, it takes -ban:

• ház → házban

Compare:

• kert → kertben = in the garden
• szoba → szobában = in the room

Because Hungarian often uses the definite article where English uses the.

• a házban = in the house

The form a is used before consonant sounds.
The form az is used before vowel sounds.

So:

• a házban
• az iskolában = in the school

Both are possible, but they emphasize different things.

Hideget érzünk a házban is a natural neutral sentence if the main new information is cold.

Hungarian word order is flexible and often shows focus or emphasis rather than strict grammatical roles.

Roughly:

• Hideget érzünk a házban. = We feel cold in the house.
  Focus on cold
• A házban érzünk hideget. = It is in the house that we feel cold.
  Focus on in the house

So the original sentence is likely presenting hideget as the important part.

Not always. A very common everyday sentence is:

• Fázunk. = We are cold.
• Fázunk a házban. = We are cold in the house.

The verb fázik specifically means to feel cold / to be cold.

So:

• Hideget érzünk is understandable and correct
• Fázunk is often more natural in everyday speech when you mean that people are cold

However, Hideget érzünk can sound slightly more descriptive, like emphasizing the sensation of cold.

The basic meaning is the same: cold. The difference is grammatical.

• hideg = the base form
• hideget = accusative form, used as the object

So the sentence does not mean a different kind of cold. It just uses the form needed after érez.

This is about Hungarian indefinite and definite verb conjugation.

Hungarian often uses:

• indefinite conjugation when the object is non-specific or general
• definite conjugation when the object is definite and specific

Here, hideget is not a specific definite object like the cold, so Hungarian uses the indefinite form:

• érzünk

A definite form such as érezzük would normally be used with a definite object, for example:

• A hideget érezzük. = We feel the cold.

Sometimes that can help you understand the structure, yes.

A very literal explanation would be:

• Hideget érzünk = We feel coldness

But in natural English, you would usually say:

• We feel cold
• or We are cold

So coldness is useful as a grammar explanation, not usually as the best final translation.

Usually the most natural meaning is We feel cold in the house.

Because hideget is indefinite, it normally refers to the sensation of cold, not a specific cold thing or the cold as a definite concept.

If you wanted to say we feel the cold, Hungarian would more likely use a definite object, for example:

• Érezzük a hideget.

So the original sentence is better understood as a general physical sensation.

In this sentence, a házban is most directly in the house.

But depending on context, English might sometimes use a more natural phrase such as:

• in the house
• inside the house
• occasionally something broader if the context allows it

If you specifically mean at home, Hungarian often uses expressions like:

• otthon = at home

So a házban is really about physical location inside the house.