Breakdown of Con un buen aislamiento, el termostato trabaja menos horas de las que tú crees.
tú
you (informal singular)
de
from / of
un
a, an (masculine)
las
the (feminine plural)
trabajar
to work
con
with
la hora
hour
que
that / than
menos
to (telling time) / minus / less
bueno
good
creer
to believe
el termostato
thermostat
el aislamiento
insulation
Questions & Answers about Con un buen aislamiento, el termostato trabaja menos horas de las que tú crees.
Why is it de las que instead of just que after menos horas?
When comparing a noun (horas) to a following clause with a conjugated verb (crees), Spanish doesn't just use que. Because the comparison involves a specific noun, you use de + the matching definite article + que. Since horas is feminine plural, it becomes de las que.
Could I use de lo que here instead?
No, because you are specifically comparing the quantity of a noun (horas). You only use the neuter de lo que when comparing an adjective, an adverb, or a general action. If the sentence didn't mention hours, you would use it: el termostato trabaja menos de lo que tú crees (the thermostat works less than you think).
Why does buen come before aislamiento, and why isn't it bueno?
Does aislamiento mean 'isolation' or 'insulation'?
It can mean both! In construction and temperature contexts like this one, it translates to 'insulation'. In social or medical contexts, it translates to 'isolation'.
Is the pronoun tú necessary before crees?
It is grammatically optional, since the verb ending in crees already makes the subject clear. Including it adds a bit of emphasis, highlighting the contrast between the actual working hours and what you personally assume.
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