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Can't improve insulation? Did you mean can? If so, yes, that's on the to do list. We need better windows too.
Yes, those are good tips thanks.
You should have at least 16” of insulation in your attic. Check for regional guidelines on this as it depends on where you live.
Insulation settles over time so the older the home the less your insulation has air gaps that do the work. This is the lowest cost form of improving your situation and the cost is mostly in labor since it’s hot work. Buy insulation yourself and do the work yourself to save a LOT. You can rent insulation blowers from big box hardware stores and they usually have deals where if you buy a certain amount of insulation the rental is free. Early morning is the best as it’ll be the coolest, drink lots of electrolytes when you start sweating. New insulation has rolled ends so it’s not the super itchy type of yore. It’s not terrible and you’ll be glad you did it once it’s over. Having a hand is not essential but makes it a lot easier.
We insulated our garage with paper backed rolled insulation for 2x4s for not much more than $300 over a few months (I did the labor) and it improved the temp swings by ~40°. Absolutely great investment and it was super easy to do. All I needed was a stapler, tape measure, utility knife, a ladder, and myself.
Buy a meat thermometer and put it in your floor or ceiling vents. You should have a 20°F+ drop from what the room is at to what is coming out of your vents. This is known as a delta T (temperature difference). If it’s lower you need to get your AC checked out by a reputable company with warranties and guarantees. Chuck and truck is always a waste of time and money, they’re lower cost up front but you will regret it most of the time. If your system is 15 years or older you may need to get it replaced as repairs are often more costly than it’s worth and all newer system are much more efficient, saving you $ in the long term.
Duct sealing is another thing that can improve your AC issues. Most ducts leak 40% due to holes in joints etc. The air you want to get to the furthest part of your house isn’t getting there at its full extent. Look for companies that Aeroseal. This will be cheaper than a mini split but can be as effective. You’re looking at a few thousand depending on the size of your situation.