3k is not cheap to most people living paycheck to paycheck. The most they could probably muster for a solar system + power station (or batteries+charge controller if they can do minor electrical wiring) without going into debt for it is most likely only a couple hundred bucks.

While a 100w fridge or tv is certainly doable, the constant or even intermittent draw would quickly eat away at a cheap 300$ power station or battery array overnight, let alone after a few cloudy days in a row. This becomes even more of an issue around winter when solar is so limited. While you can have these things with solar, you need to invest a good amount of $ into batteries and learn to properly wire them or pay out the nose for a comparatively way overpriced in Wh/$ power station.

If you care about the financial side first and foremost, as with any investment its important to consider how long it takes for energy saving to pay back the initial cost of the solar system. If you are a home owner or long term RV/vanlifer that uses a ton of wattage daily it makes sense to shell out many thousands for permanent high quality solar installations and have it pay itself off in 10 years.

If you are a renter on the other hand who doesn’t own property or a paid off semi-livable vehicle to invest in long term, and can only haul around a 200W portable panel or two and some batteries/powerstation, not so much. In their case 300-500$ portable system can potentially pay for itself relatively quickly.

Dehumidifiers are a thing, though it would depend on how big your house is and just how severe the humidity in your area. ambient 90 degree heat isn’t pleasant but can become bareable with a good fan and damp cooling rags on you, I had to deal with the heat quite a few days this year 95-100 degree temps inside during the hottest parts of the summer, and have never appreciated the power of a good fan providing personal cooling more. Its no substitute for real AC space cooling, but its the next best thing to make >90 degree heat bareable.

I am just starting out and am happy to barely scrape by knowing I didn’t have thousands of $ to invest in a powerful system for things I didn’t personally believe I needed. To me a fridge is a moderate convenience, not a survival necessity. Everyones situation is different though and I get that. If you require life sustaining medication that needs to be refrigerated for example. In that case the best bet for an energy efficent fridge is one that has a cooler form factor where you open it from the top so the cold doesn’t spill out. Probably annoying to get to stuff compared to regular door fridge but will be much more efficent.