homeassistant

I assume it isn't much of a drop though 240v to 210v ish drop.

If you had that big of a drop, it would likely have already caused the local power grid to trip and turn off. That hardware is not designed to run at a very large frequency differential from normal, and while 30v might not sound like a lot, it's still enough to massively change the Hz of the AC.

Not sure if you got this idea from Technology Connections but he recently didn a video using this exact premise.

I checked HA and found that A) my furnace fan is likely dying as the furnace overheats and power cycles frequently and B) despite the overheating, or furnace has only run at most 25% of the day during the coldest temps we've gotten this winter (which has been mild and only down into the low 30s). I think if/when we replace the furnace we can safely cut the BTU rating down while still maintaining our desired temperature.

Having an oversized furnace really isn't a bad thing, and only having it run half the time sounds like a good thing to me.

One of the nifty things about smart thermostats like Ecobees is that you can pull usage data from their web portal.

Ecobee also let's you connect over HomeKit and allows you to control when the internet is out 😉at my old house I actually blocked the mac address for non internal and just had HA automatons take care of the rest.

Did you use any established project for your weather station or just make it up for yourself? I've been interested in building an esphome weather station as well.

I've had a temp/humidity temperature in all house rooms for a few years now, and it's dead useful.

Balancing the radiators and TRVs so everything heats up evenly.

Spotting anomalies (top floor loses a lot more heat when the wind is blowing)

And setting the flow temperatures for the radiators, as I can see the rate of heating compared to outside temperatures.

1. Motion sensors. The mmWave are very sensitive but also expensive. Nice for rooms where you sit still or lie down for longer periods, such as an office or bed room. PIR sensors are the cheap ones, very useful for hallways, stairs, kitchen and toilets.
2. Some smart plugs measure current. Innr has a nice zigbee smart plug with a physical button and monitoring for around €20.

FYI If you have a Zigbee bridge, you can just connect most zigbee devices to it and you are not tied to the app or devices of the bridge's brand.

You'll want to research "room presence" systems.

Here's one I've been looking at implementing for an example: https://espresense.com/

Depending on the location, but

1. Often rain comes along for the ride on a warm front as it moves over the property (although cold fronts also carry rain)
2. In winter, the rainclouds act as insulation and so rainy days are warmer than blue-sky days

It's probably rain clouds trapping heat from escaping into the atmosphere, and humid air equalizing the temp by sucking heat off of high heat capacity surfaces like rocks and cement, warming the air.

That's just my guess though. I have no relevant scientific expertise.