IMHO the optimum placement for registers is less important than reducing the total amount of ductwork in unconditioned space. if that means sidewall registers on interior walls so be it.
I really do like the registers we currently have.
Man, you and Florida Joy are going to be more knowledgable and qualified than 90% of the sales guys out there.
If you get a new thermostat it would be nice if it had a data logging feature (like my ecobees). Seeing how the equipment, indoor and outdoor temps interconnect is really useful.
I suspect locking your furnace on low stage will help.
Btw, who defined your insulation as "OK"? That type of undefined descriptor makes me question their competence, much less qualification. Inches or rated r value are measurements that have meaning to us. OK doesn't.
Its been considered a good practice since central heating plants and distributed heat came to be that radiators then later forced air supplies were placed under windows to reduce the feeling of drafts. More of an issue with single pane glass that modern thermal panes. Before that you had fireplaces that radiated most of the heat. You also had gravity furnaces with interior ducts.But it had limits as well. My home has about 40 windows. Some are in sets but even then i only had 18 radiators so about 1/3 of the windows didn't have radiators under them. I do wish the hack company that installed the forced air system had installed 18 supplies. :)
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IMHO the fewer number of supplies the better. Less ductwork losses. Of course supplies must be placed in the room correctly to get proper distribution. And I will never figure out why Installers put a register right over where the bed is "designed to be" in a master bedroom..
As I mentioned about the air not being that cold in COOL mode in one of my earlier posts on this thread, I did forget to mention that there's air that's leaking out in the middle of the coil. Could that be affecting the temperature of the air by causing the hot air in the attic to enter the coil?
The sales consultant evaluated all the insulation and he said that there was enough of it. Apparently I don't think he was really checking it that well. I also don't remember him telling me what the r value or how many inches of insulation there really is. It makes me wonder.... I should really call someone who knows how to PROPERLY evaluate insulation!
Comprehensive home assessment time. Isn't Allison Bailes in Atlanta? If he can't do it maybe he can suggest someone.