[kuzee]

Some ideas:

Drone that can clean your gutters while avoiding obstacles like trees and chimneys. This might be very hard, but would be a challenge.

A series of smart heating/AC vents that open/close based on whether people are in the room. Make them solar powered and "sleep" to save power. I think this might be possible without a microcontroller, but maybe easiest with a very energy efficient one.

Window that opens when the outside temperature is closer to your target temp than the inside temp. E.g. if your home is set to cool but it's cooler outside, open the window. Need a rain sensor.

A very large Roomba. Traditional roombas are small, and not super effective as a result. Tolerating a bigger one might be work it. Get one of those battery powered vacuums that work off of power tool battery packs, perhaps.

[mikewarot]

Drones don't have the torque or ability to deal with impacts to really be of much use in cleaning gutters... but Roomba makes a tank (ok, mini tracked vehicle) to do it...

https://store.irobot.com/default/looj-gutter-cleaning/irobot...

[kuzee]

Wow, I had no idea that this existed, thanks.

I agree that a drone for cleaning gutters would be incredibly hard due to the torque necessary. Less of a project, but a drone that picks up the Roomba Looj and can place in the gutter would be fun but not that interesting of a challenge.