Lots of panels, no empty spaces
We purchased a house from someone who did a lot of work themselves. I'm pretty new to electrical stuff. Sorry if I confuse some terms.
We have a 200A main panel. It has a 100A sub panel right next to it, neither accept tandem breakers. From our service, there is another thick wire running to our garage, where there is a 40 space panel, it doesn't have any main breakers. This panel is complete full as well. It has an 80A sub panel running to our pool filter and heater.
I'd really only need a 4-6 spaces near the main panel, but I'm not sure about what way to get them. Everything is very poorly labeled on the panels. The major things I have in my home is 2 wells, one using 30A, another using 20A and 4 HVAC systems. I know replacing a panel with something that accepts tandems would most likely be expensive. I'm not sure what to do, any help would be appreciated!