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[quote=Anonymous]OP: you have three problems based on what you said. First, you have inadequate cooling of your upper level. That is in the first instance very likely due to inadequate insulation. Usually, you install the insulation on the floor of the attic, between the ceiling joists/attic floor, and you should optimally aim for at least R-49 (about 14" of blown fiberglass). However, you have a problem in that your A/C air handler is there. I assume you mean your evaporator (where the heat is absorbed and sent to the condensor outside) and the blower unit distributing the air is in this attic, an unconditioned space. That is definitely ideal, although a good HVAC installer would have done meticulous air-sealing and insulating. Some additional problems you may have that contribute to the overheated upstairs, include: 1) you need to meticulously airseal every penetration between the living space and the attic. Every light box, wall seam, anywhere a wire is running up through the stud wall, etc. Insulation is pointless if there is airflow through it. 2) Your HVAC system is working extra hard in that unconditioned space. One way to mitigate that is to make the attic conditioned space (hence, remove the insulation from the attic floor and insulate the underside of the roof (and in doing this, you would need to close off all the air penetrations, etc.)). This is probably not feasible. SO you need to focus on making sure you have adequately insulated and sealed ductwork, a job a good HVAC tech would do. 3) That plywood sitting on the ceiling joists that you stand on and store things on up there? It's compressing your insulation and making it not work properly, Unless you have 2x12 ceiling joists, and you likely only have 2x8s at the most, you need to raise that up. Put 2x4 or 2x6s on top of the joists and then insulate (and airseal penetrations first) and  then put the storage plywood down. There's more, but probably worth considering these as the first, obvious issues. [/quote]

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