Don’t listen - Oz Post - max 20kgs per box. Post office to your home in Bangkok in around 1 week for around AUD180 per box. In my case no duty or any extra charges levied. Highly recommended
completely overblown - far more English than Russian speaking Farangs here. And many of the Russians speak great English as well - never had a bad interaction
I’d suggest sell and rebuy: new technology is way cheaper than you may remember it 10 years ago - transport / insurance / import duties / worry etc just not worth it
Most people here never cool the entire house - living rooms during the day, occupied bedrooms at night. Single split systems, one per room is standard.
There will be a huge difference in energy consumption between new 5 star energy rated appliances through vs older appliances.
And of course the area of Thailand you choose will make a difference.
An average house in Thailand is a standard 1,500 square feet 2 storey 3 bedroom moo ban house. My wife and I rented one in Phuket that was about 5 years old (so pretty efficient appliances) with our son (so 2 bedrooms chilled overnight and living room during the day) and a typical electricity bill was 3k-5k per month.
If you are buying or building a house you can upgrade your appliances to 5 star, add solar and your bill can be close to zero.
Or you can buy a larger house with old appliances and your bill will likely be 15k per month or more.