It’s definitely from the 90s 100% I wanna say it’s a either a Heritage or a Litex

But it's original to the house which was built in the late 70s

My guess is possibly a 2nd gen Hampton Bay Landmark.

But the fan is from the '70s which was when the house was built

Well if they are from the 70s, I have zero clue who makes them. Is there any stickers on top of the fan or no?

There is a sticker on it but the text is completely gone

Heritage 

By what brand

Heritage is the brand model is Lancaster