This is a perfectly executed video. It has all the information I was looking for at just the right pace with no BS. I wish more people made content like this. Subscribed.
good to see a user posting real info. I have a smaller house, 1x multisplit with 4 inside units (3x 9000 BTU, 1x 6000 BTU), and 1x large (12,000 BTU) single split unit for redundancy (in case of issues). The house is 100% electric, and these units are our only heat/cool source. Based on last 2 years energy consumption, we just installed 7.5kW solar panels, and our grid offers 1-for-1 kWh swap (no cash), so every kWh over-produced in summer, we get back for free in winter, with a theoretical zero-sum per year. We also use a solar water heater with antifreeze closed-loop (all-year), 200-liter hot-water storage tank, supported by a 3.5 kW immersion heater for winter, which we put on a 1-hour-per-day timer in the evening - if needed. Investment return in max. 5 years (prob. 3-4 years), with 20-year expected minimum system life. As you say, - quiet, fast, economic, and with added features like air circulation filters, silver ionisers, motion sensors etc. Insulation is a critical aspect, even if only ensuring no draughts and no major heat bridges (thin windows/doors, or uninsulated ceilings/floors). Many people in UK say they cannot fully insulate their old(er) houses economically, but major improvements can often be made with careful choices and targeted methods. An infrared thermometer is cheap these days to scan for hotspots.
