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Sidebar before I get too far - what's with every different manufacturer's circuit breaker in the panel? What do each of the 3 breakers feed? Here is what I suspect - one feeds North, one feeds South, and one breaker feeds the photocell that in turn feeds a contactor that takes the...

Top panel is a split bus - no main breaker that shuts off everything, just multiple 2 poles for the large loads and a 2 pole 60 that feeds the lower half. 100A and 200A main breakers must have been incredibly expensive back in the day as I think I've seen all of the major brands with a split bus...

Completely disregarding the vampire energy waste/power savings argument, one way to cut power would be to use a 2 or 3 pole contactor to remove power. The coil of the contactor could be driven by something as simple as a light switch, a start/stop button combination, a timer switch, and anything...

The breaker in the sub/house panel can be the same size or larger. Its purpose isn't to act as a breaker but rather a mechanical disconnect. A 100A main breaker is probably the easiest and most common breaker you'll find for this use, so I would use that. The outside 90A is the breaker providing...

Do you have natural gas available in your area?

What make/model number of garage door opener?

You could reuse the existing DirecTV coax to handle communications, using either MoCa or DeCa. https://www.amazon.com/dp/B01AYMGPIO/?tag=atomicindus08-20

This sounds easy to solve with home automation, but a nightmare to initially configure/setup if you don't already have a setup.

My old attached garage (torn down to replace with a slightly bigger one with a 2nd story addition) was built in 1995/6 and had the same fiber board stuff. The old garage was unfinished, so leaning a bicycle against the fiber board would punch holes in it and you could see the backside of the...

Are you sure about that?

From what I can tell, the Nyle heat pump add-on is no longer available. Such a shame, too, as it allowed a ton of flexibility in where to mount it and what fuel source (gas or electric) to use on the connected tank.

It appears the 240VAC inverter generators don't have any provisions to parallel them with other generators. I think that would be a nice feature to have, if you wanted to start an A/C or some other large load.

Home Depot has a ZeroEnergy Heat Recovery device. No experience, the idea intrigues me but natural gas is so cheap these days it makes it hard to justify the expense. https://www.homedepot.com/p/ZeroEnergy-Heat-Recovery-Water-Heater-System-Zero-Energy-ZE-TSHRU/203715807

There is a plug in dimmer module, if the undercabinet lights just plug in (and are dimmer capable).

Lutron Caseta seems to be one of the better ones out there: https://www.casetawireless.com/

Don't run a neutral off of the ground in the heater! You can use a variety of home automation services to have a thermostat indirectly drive a WiFi plug. For instance have Alexa turn on the plug when the thermostat reaches a certain threshold and off when it reaches another set point.

Works when you can actually get into a Goodwill or thrift store...

Just to be sure we are talking the same thing, is this what you are referencing for $40? https://www.chamberlain.com/smart-light-switch/p/WSLCEV-P1 It just replaces your light switch. No extra wiring, it just programs the same as a remote. Garage opens, lights go on. Garage door closes...

$40 seems dirt cheap once you factor in everything you will need to do what you want - new 3 way switch, NM-B running from the opener to the switch location, light bulb sock adapter to get the opener light power, the inlet box detailed above, etc. Keep in mind the Chamberlain/Liftmaster switches...

If you already have the propane for floor heat, why not a combo boiler that can do both hot water and heat? Then do a small 5 or 10 gallon electric for normal sink use. Or a 40 gallon propane water heater? A power vent wouldn't use much energy.