Need a BR HVAC design specialist to diagnose and repair HVAC system

Winters Air.

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but keep in mind it’s literally 100 degrees every day this time of the year. It’s just fricking hot outside

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yes, I know.

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It’s hot

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Yes, I know.

Checking outlet vents is a good starting point. Also go outside and check the 2 freon lines on each A/C unit. The big one should be cold and the small one fairly hot. Also check that the fans are blowing out fairly warm [hot] air.

Make a mental note of how the 2 units compare on each of this things.

Also, when checking the outlet vents, be sure to see if both A/C units are blowing out the same amount of air.

If the A/C units have not had the coils cleaned this spring, this could be cause your problem. Also, have the air filters always been changed regularly?

Call Kennedy Mechanical. LINK

I 100% guarantee he can figure your problem out quick and fix it the right way without upselling you on contracts or unnecessary BS. He has fixed the same issue on my house and about 5 other people that I know. I’m not related or anything, just a happy customer after using several supposedly reputable companies that couldn’t deliver.
Make sure the owner, John, comes out for the consult.

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Vents closest to intake are coldest. 9° difference. 71° to 80° It’s not been this bad in the past.

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You may have multiple issues with air flow, insulation, envelope leakage, etc. but a 9 F split between the return vent and closet air supply vent does sound to me more like a equipment/refrigerant issue - you should have something on the order of a 16 to 20 F temperature split. If it was strictly an reduced air flow issue but with properly working equipment, one might expect a higher temperature split between the return plenum and supply plenum or closet supply register.

If you use one of the techs recommended and get a good outcome, let us know - many, including myself, are looking for a good tech in the BR area with a good diagnostic skills.

CrawDude

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but a 9 F split between the return vent and closet air supply vent

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I think he is saying..... The closet vent is 9 degrees cooler than the vent farthest away. And that is a big difference in vent outlet temperatures. I don't remember if he said if the air flow at all vents is about the same or is his "HOT" part of the house not getting good air flow.

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I think he is saying..... The closet vent is 9 degrees cooler than the vent farthest away. And that is a big difference in vent outlet temperatures. I don't remember if he said if the air flow at all vents is about the same or is his "HOT" part of the house not getting good air flow.

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Understood - then that would certainly suggest air flow, duct size, duct insulation, related issues, maybe in addition to some equipment issues.

Which does provide an opportunity to remind everyone that duct work and associated airflow is every bit as as important as the equipment sizing and operation in home comfort. One on the HVAC techs on the HVAC Talk Forum likes to state, the equipment just cools or heats the air, but the duct work is what really provides home comfort. All the components are equally important. Most the techs on that same forum state the the most common problem they see with homeowners with chronic home comfort issues is over sized equipment (tonnage) with undersized ductwork.