Ελέγχουμε κατά πόσο η ενεργειακή αναβάθμιση βελτιώνει την ενεργειακή κατηγορία.

κατά πόσο is a very common Greek expression meaning whether, to what extent, or how far.

In this sentence, it introduces an indirect question:

• Ελέγχουμε κατά πόσο... = We check whether... / We examine to what extent...

So it is not a word-for-word phrase you should try to translate literally every time. It works as a fixed expression.

Ελέγχουμε is the 1st person plural present tense of ελέγχω = to check / to inspect / to examine.

So literally it means:

• we check
• we examine
• we verify

Greek often uses we in formal, academic, technical, or report-style language, just like English sometimes does:

• We check whether...
• We examine whether...

So this does not necessarily mean a specific group of people standing there; it can be a neutral, formal style.

Because it is the subject of βελτιώνει.

The structure is:

• η ενεργειακή αναβάθμιση = the energy upgrade/energy improvement
• βελτιώνει = improves
• την ενεργειακή κατηγορία = the energy category

So:

• the energy upgrade is the thing doing the action
• therefore it appears in the nominative case

That is why you get:

• η (nominative feminine singular article)

Because την ενεργειακή κατηγορία is the direct object of the verb βελτιώνει.

The verb βελτιώνω means to improve something, so the thing being improved goes in the accusative case.

Compare:

• η ενεργειακή κατηγορία = the energy category (subject, nominative)
• την ενεργειακή κατηγορία = the energy category (object, accusative)

So in this sentence:

• the upgrade improves the energy category
• therefore κατηγορία must be in the accusative: κατηγορία → κατηγορία
• and the article changes: η → την

Because both nouns are being described as energy-related:

• ενεργειακή αναβάθμιση = energy upgrade / energy improvement
• ενεργειακή κατηγορία = energy category / energy rating

The adjective is ενεργειακός, -ή, -ό and here it appears in the feminine singular form ενεργειακή, because both:

• αναβάθμιση
• κατηγορία

are feminine singular nouns.

So the adjective must agree with the noun in gender, number, and case.

No. That is an easy false-friend type of mistake.

In this context, ενεργειακή means:

• energy-related
• concerning energy
• energy efficiency / energy performance depending on context

So:

• ενεργειακή αναβάθμιση is not an energetic upgrade
• it means an energy upgrade, usually something that improves energy efficiency

Likewise:

• ενεργειακή κατηγορία usually means something like energy category, energy class, or energy rating

αναβάθμιση literally means upgrade, improvement, or upgrading.

In technical or building-related contexts, ενεργειακή αναβάθμιση usually refers to:

• improving insulation
• replacing windows
• upgrading heating systems
• making a building more energy-efficient

So depending on context, you might translate it as:

• energy upgrade
• energy-efficiency upgrade
• energy improvement

βελτιώνει is the 3rd person singular present tense of βελτιώνω = to improve.

So it means:

• he/she/it improves

Here the subject is:

• η ενεργειακή αναβάθμιση

Since that noun phrase is singular, the verb is also singular:

• η αναβάθμιση βελτιώνει = the upgrade improves

Greek often uses the present tense in general statements, technical descriptions, instructions, and academic writing.

So:

• Ελέγχουμε... = We check / We examine
• βελτιώνει... = improves

This does not have to mean the action is happening right this second. It can mean:

• this is what we do in general
• this is what is being tested
• this is the procedure

English often does the same thing:

• We check whether the upgrade improves the rating.

Because κατά πόσο introduces an indirect question, not a να-clause.

Greek uses να mainly for subjunctive-type structures, for example:

• Θέλω να δω = I want to see

But here the structure is more like:

• We check whether X improves Y

So Greek says:

• Ελέγχουμε κατά πόσο η ενεργειακή αναβάθμιση βελτιώνει...

No να is needed.

Yes, in many contexts αν could also be used:

• Ελέγχουμε αν η ενεργειακή αναβάθμιση βελτιώνει την ενεργειακή κατηγορία.

That means:

• We check if/whether the energy upgrade improves the energy category.

However, κατά πόσο often sounds:

• a bit more formal
• a bit more analytical
• more like to what extent / whether

So in technical or formal writing, κατά πόσο is often especially natural.

Greek uses the definite article much more often than English.

So Greek naturally says:

• η ενεργειακή αναβάθμιση
• την ενεργειακή κατηγορία

even where English might say:

• energy upgrade
• energy category

In Greek, this sounds normal and idiomatic, especially in formal or technical language.

So do not expect article use to match English exactly.

Yes, Greek word order is more flexible than English because case endings help show what is subject and what is object.

The neutral order here is:

• Ελέγχουμε κατά πόσο η ενεργειακή αναβάθμιση βελτιώνει την ενεργειακή κατηγορία.

But Greek could rearrange parts for emphasis, for example:

• Κατά πόσο η ενεργειακή αναβάθμιση βελτιώνει την ενεργειακή κατηγορία, ελέγχουμε.

That sounds more marked or stylistically special, not the most neutral everyday wording.

So the original sentence is the most straightforward and natural order for formal prose.

There are two main clues:

1. Case/article

   • η = nominative feminine singular → subject form
   • την = accusative feminine singular → object form

2. Verb meaning

   • βελτιώνω is transitive: someone/something improves something

So:

• η ενεργειακή αναβάθμιση = the thing doing the improving
• την ενεργειακή κατηγορία = the thing being improved

Even if the word order changed, the cases would still help you identify the roles.

Often, yes.

Literally it is:

• energy category

But in real-world usage, especially for buildings or appliances, it can correspond to:

• energy rating
• energy class
• energy efficiency category

The exact English translation depends on the context. If this is about certificates, buildings, or appliances, energy rating/class may sound more natural in English than the very literal energy category.

A rough pronunciation guide is:

E-LENG-hoo-me ka-TA PO-so ee e-ner-ya-KEE a-na-VATH-mi-see vel-TIO-ni teen e-ner-ya-KEE ka-ti-go-REE-a

A few useful notes:

• γχ in Ελέγχουμε sounds roughly like a soft throaty sound before h
• η / ι / υ / ει / οι are all pronounced like ee
• stress matters, so pay attention to:
  • Ελέγχουμε
  • πόσο
  • ενεργειακή
  • αναβάθμιση
  • βελτιώνει
  • κατηγορία

The sentence breaks down like this:

• Ελέγχουμε = main verb: We check / We examine
• κατά πόσο = introduces an indirect question: whether / to what extent
• η ενεργειακή αναβάθμιση = subject of the embedded clause
• βελτιώνει = verb of the embedded clause
• την ενεργειακή κατηγορία = object of the embedded clause

So the pattern is:

[Main verb] + [indirect-question marker] + [subject] + [verb] + [object]

That is a very useful Greek pattern to recognize in formal writing.