Az energiahatékony fűtés nem pazarló.

Az is the definite article, meaning the.

So:

• az energiahatékony fűtés = the energy-efficient heating

Hungarian has two forms of the:

• a
• az

You use az before words that begin with a vowel sound. Since energiahatékony begins with e, the correct article is az.

Yes, energiahatékony is one word, and that is very normal in Hungarian.

It is made up of:

• energia = energy
• hatékony = efficient, effective

Together, energiahatékony means energy-efficient.

Hungarian often forms compound words where English would use two separate words or a hyphenated form. So English energy-efficient becomes Hungarian energiahatékony.

Fűtés is a noun. It means heating.

It comes from the verb:

• fűt = to heat

The ending -és often creates a noun from a verb, similar to English -ing or a verbal noun in some contexts.

So:

• fűt = heat
• fűtés = heating

In this sentence, fűtés is the main noun of the subject: the energy-efficient heating.

In the present tense, Hungarian often leaves out is in sentences like this.

So:

• Az energiahatékony fűtés nem pazarló. = Energy-efficient heating is not wasteful.

Literally, Hungarian says something closer to:

• The energy-efficient heating not wasteful.

This is completely normal. In the third person singular and third person plural in the present tense, the verb van (is/are) is usually omitted in simple equational or descriptive sentences.

Compare:

• A ház nagy. = The house is big.
• A fűtés pazarló. = The heating is wasteful.

But in other tenses or some other constructions, the verb does appear.

Because nem is the normal word for not, and it usually comes directly before the thing it negates.

Here it negates the adjective pazarló:

• pazarló = wasteful
• nem pazarló = not wasteful

So the structure is very straightforward:

• Az energiahatékony fűtés = the energy-efficient heating
• nem pazarló = is not wasteful

Pazarló is an adjective meaning wasteful, extravagant, or given to wasting.

It comes from the verb:

• pazarol = to waste

So:

• pazarló = wasteful / waste-producing / inclined to waste

In this sentence, it describes the heating system or method as not wasteful.

No. Hungarian does not have grammatical gender like many European languages, and adjectives do not change for gender.

Also, when an adjective comes before a noun attributively, it usually does not change for number either.

So:

• energiahatékony fűtés = energy-efficient heating
• energiahatékony fűtések = energy-efficient heating systems / types of heating

The adjective energiahatékony stays the same.

This is much simpler than in languages where adjectives must agree in gender, number, or case.

No, not in standard Hungarian.

Because energiahatékony starts with a vowel sound, the definite article must be az, not a.

So:

• az energiahatékony fűtés = correct
• a energiahatékony fűtés = incorrect

A useful shortcut:

• use a before consonant sounds
• use az before vowel sounds

The basic structure is:

• Az energiahatékony fűtés = subject
• nem pazarló = predicate

So the sentence pattern is:

Subject + not + adjective

This is a very natural neutral word order in Hungarian.

Hungarian word order is flexible, but in a plain statement like this, the sentence is nicely regular and easy to understand.

A rough guide:

• fűtés ≈ fyoo-taysh
• pazarló ≈ paw-zawr-loh

A few important pronunciation notes:

• ű is a long rounded vowel not found in English. It is somewhat like saying ee while rounding your lips.
• é is a long vowel, roughly like ay in say, but cleaner and without much glide.
• á is a long open vowel, somewhat like the a in father.
• ó is a long o sound.

Also remember that Hungarian stress is almost always on the first syllable:

• Energiahatékony
• FŰtés
• PAzarló

Yes, they matter a lot. In Hungarian, accent marks are not optional: they are part of the spelling and often change the pronunciation and sometimes the meaning.

For example:

• u and ú are different vowels
• ü and ű are also different vowels
• o and ó are different
• a and á are different

So you should learn words with their accents from the beginning:

• fűtés, not futes
• pazarló, not pazarlo

Leaving off accents is considered incorrect in standard writing.

Normally, as an attributive adjective, it goes before the noun:

• energiahatékony fűtés = energy-efficient heating

Putting it after the noun would not be the normal way to express this in Hungarian.

If the adjective is part of the predicate, then it can come later in a sentence, for example:

• A fűtés energiahatékony. = The heating is energy-efficient.

So:

• before the noun: adjectival modifier
• after the noun: usually predicate adjective

Not naturally. Fűtés means heating, not heater.

If you wanted heater, you would usually need a different noun, such as something like fűtőberendezés depending on context.

So this sentence refers to:

• heating as a system, method, or process

not to:

• a physical heater device

With az, it can sound like a specific or identifiable thing: the energy-efficient heating.

But in Hungarian, just like in English, context matters. Depending on the situation, it might refer to:

• a specific heating system already mentioned
• energy-efficient heating as a known category in context

If you wanted a more general, article-less style like English sometimes allows in headlines or abstract statements, Hungarian usually still handles that in its own way, often with the article if the noun phrase is definite in the context.

So the safest reading here is:

• The energy-efficient heating is not wasteful.

More or less, yes:

• Az = the
• energiahatékony = energy-efficient
• fűtés = heating
• nem = not
• pazarló = wasteful

But remember that English needs is, while Hungarian leaves it out here.

So a word-for-word gloss would be:

• The energy-efficient heating not wasteful

The natural English translation is:

• Energy-efficient heating is not wasteful.
• or The energy-efficient heating is not wasteful. depending on context.