I've always used WiFi Analyizer on a phone/tablet if I needed to survey a location. That said, a thread on linuxquestions.com led me to: https://alternativeto.net/software/inssider/?platform=linux#. Looks like some options at least, don't really know if they're decent.

This would be interesting. I have 3 zones for heat in my house and I never know what to set for the best efficiency.

Ex: the bedroom zone is set to 58, but the thermostat is in a room with a closed door. If I leave it closed, it makes the bedroom where I am nice and toasty...sometimes too toasty. If I simply open the door, it is getting the heat from the living room zone, and cools down the bedroom where I am. I worry that I am using too much oil if I leave the door open.

Saving $$$ on the oil is an issue...especially where I am. It got down to 3 degrees last night and was at 0 on Friday. Normal lows in January is 12, but it's been pretty cold this month so who knows how cold it will get!