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Re: Temp dif split
The above reasons are some of the reasons I stopped even bothering to take TD measurements many years ago.
Give the unit a good 'looking over', you can see a dirty (blocked) coil, and you can also see if someone just 'scraped or brushed over' the surface of the coil, leaving the coil still 'dirty and blocked'.
Look for leaking air (that skews TD readings too), look for blocked, crimped, collapsed, damaged, leaking duct work (yes, that also skews TD readings), look for a filter, a dirty filter, feel the 'U' shaped fittings on the coil which connect the lateral refrigerant lines running through the coil and make sure they are all cold (I think the upper ones being warm are an indication of low refrigerant - one of the a/c guys here will correct/re-state that as needed), look ... look ... look ...
By the time you are through 'looking', unless (or even if) the system is brand spanking new (new construction) your list will be large enough to recommend having the system cleaned and serviced by an a/c contractor, then after cleaning and servicing, have the a/c contractor advise the condition of the system.
If it's brand new, it's brand new ... and under warranty, but that does not mean it is 'right'.
If it is not brand new, it's old and dirty ... and under warranty or not, you want to look for signs that it is operating as it should be, however, you will be writing down the signs showing that it is not operating as it should be.
I found very few which did not need cleaning and servicing BEFORE anyone could assess if the system was operating properly. Being as HIs do not clean and service a/c systems (at least *I* did not), that means that most a/c systems will need cleaning and servicing *before* they can be pronounced 'A OK'.
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