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We have an ac unit outside, looks like this

https://gshaservices.com/product/comfort-13-carrier-air-conditioner/

So the idiots that put our siding on punctured the coolant line, and we ran it for a few days it was blowing kind of cold air but it never actually cooled upstairs. This was for about a week. Then we have them fix it, but it turns out it was still leaking because they came in again and they had to refill the unit again with R134 or whatever. It ran leaking again for another month. Our power bills went from 380kw to 1600kw for one month

Question is, how much damage is done to the unit running it with no coolant or to the point where it doesn't actually turn off?

We have an ac unit outside, looks like this https://gshaservices.com/product/comfort-13-carrier-air-conditioner/ So the idiots that put our siding on punctured the coolant line, and we ran it for a few days it was blowing kind of cold air but it never actually cooled upstairs. This was for about a week. Then we have them fix it, but it turns out it was still leaking because they came in again and they had to refill the unit again with R134 or whatever. It ran leaking again for another month. Our power bills went from 380kw to 1600kw for one month Question is, how much damage is done to the unit running it with no coolant or to the point where it doesn't actually turn off?

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Running low coolant will freeze (like ice like old school freezers) on a-coils in your house blocking air flow and creating a mess.

Because not enough pressure in line to circulate and when fan goes humidity will freeze on them

Compressor should be because if get lows there is switching to turn off to prevent damage.

Bitch at the siding people and get it professionally repaired and recharge system. The line is probably okay if like a pinhole they could probably just solder it closed.

Make sure evac the system and vaccumm the atmosphere out, recharge.