Dang, that sucks. I thought the 18's were still 134a systems. I know the '19 from this morning was a 1234yf system, luckily for them they didn't need any though. Stuff is HIGH. When 1234yf was first introduced, i went from paying about $200 for a 30lb cylinder of 134a, to $850 for an 8lb cylinder of 1234. Its half that now luckily.
And beware, most shops are charging 1234 systems with 134. They are more similar than initially taught to techs.
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He must've thought that the system was blowing the coldest it could then to not atleast evac it and verify the freon capacity. Something that definitely should be done if the customer is either insinuating or directly telling you it's not operating as it was before.
And looking at tons of different systems on tons of different manufacturers I'm not sure how a tech can say yep that system is filled to 100% capacity and know for sure that its not possibly at least .2 .3lbs low.
So hopefully you're right and shes just slightly low. Its brutal out right now, and at least here in Hinds co. , there aint a stitch of wind out.......i'm freakin dying out here LOL.