1. real estate agent
مُشاورِ اَملاک
moshaver e amlak
2. real estate agency
بُنگاهِ مَعامِلات مِلکی
bongah e moamelat e melki
3.AC
کولِر، سیستِمِ خُنَک کُنَنده
cooler, system e khonak konande
4.heating system
هیتِر، سیستمِ گَرمایِش،بُخاری
heater, system e garmayeshi, bokhari
I tried to mention the definitions which are similar to the English words for number 3 and 4 so it wouldn't be so hard for you to memorize them.
good luck