Tehostamme jäähdytystä siksi, että sisälämpötila on liian korkea.

Tehostamme is the 1st person plural present tense form of tehostaa.

• dictionary form: tehostaa
• stem: tehosta-
• ending: -mme = we

So tehostamme means we intensify / we increase / we boost.

This is very common in Finnish: the verb ending already tells you who the subject is.

Because Finnish usually does not need a subject pronoun when the verb ending already makes the subject clear.

• tehostamme = we intensify
• me tehostamme = we intensify, but with extra emphasis on we

So the version without me is completely normal and neutral.

Here jäähdytystä is in the partitive singular.

The basic form is:

• jäähdytys = cooling

In this sentence, Finnish uses the partitive object because the action is seen as ongoing / not total / not a completed whole. We are increasing cooling, not doing something to a clearly finished, bounded object.

So:

• tehostaa jäähdytystä = intensify cooling

This is very natural Finnish usage. English learners often want a more direct object form, but Finnish often chooses the partitive in situations like this.

In this sentence, siksi, että introduces the reason: because.

You can think of it literally as something like for the reason that.

Yes, in many situations koska can replace it:

• Tehostamme jäähdytystä, koska sisälämpötila on liian korkea.

That also means We are increasing the cooling because the indoor temperature is too high.

A rough difference:

• koska = the most basic, direct because
• siksi, että = a bit more explanatory or structured, like for the reason that

Both are correct here.

Because Finnish normally uses a comma to separate a main clause from a subordinate clause.

Here:

• main clause: Tehostamme jäähdytystä siksi
• subordinate clause: että sisälämpötila on liian korkea

So the comma is standard Finnish punctuation.

Yes. Finnish very often makes compound nouns, where English might use two words.

sisälämpötila is made from:

• sisä- = inner, inside, indoor
• lämpötila = temperature

So sisälämpötila means indoor temperature / inside temperature.

Writing it as one word is normal Finnish spelling.

Because Finnish has no articles like a, an, or the.

So sisälämpötila can mean:

• indoor temperature
• the indoor temperature

Which one is meant depends on context.

English speakers often look for a missing the, but in Finnish there usually is none.

When talking about temperature, Finnish commonly describes it as high or low, not hot or cold in the same way English sometimes does.

So:

• lämpötila on korkea = the temperature is high
• lämpötila on matala = the temperature is low

And:

• liian = too
• korkea = high

So liian korkea is the natural Finnish way to say too high about temperature.

Because after on in a normal sentence like this, the adjective is a predicate adjective, and here it is in the nominative:

• sisälämpötila on liian korkea

So korkea agrees with the subject as a basic predicate form.

English speakers sometimes expect another case because Finnish uses cases so much, but with a simple statement like X is Y, the adjective is often just in the nominative.

Finnish word order is fairly flexible, but not every change sounds equally natural.

This sentence in its original order is very normal:

• Tehostamme jäähdytystä siksi, että sisälämpötila on liian korkea.

If you want to put the reason first, Finnish would more naturally switch to koska:

• Koska sisälämpötila on liian korkea, tehostamme jäähdytystä.

That sounds more natural than trying to front siksi, että.

So yes, the idea can be reordered, but Finnish may prefer a different connector when you do that.

Yes. Tehostaa is a regular -aa/-ää verb type.

The present-tense forms are built from the stem tehosta- plus personal endings:

• tehostan = I intensify
• tehostat = you intensify
• tehostaa = he/she/it intensifies
• tehostamme = we intensify
• tehostatte = you all intensify
• tehostavat = they intensify

So tehostamme is formed normally:

• tehosta-
  • -mme → tehostamme

There is no extra long aa before -mme.