I'm tossing out my fan project for suggestions.
Ok here's what I want to do.
I have a window fan that I'd like to come on if the room gets over say 70o but only if the outside temperature is say less than 65o. Ideally I'd like the temperatures to adjustable but would accept fixed settings if it simplified things. My first draft idea is to use 2 cheap thermostats, one on the outside and one on the inside of the house wired in series and connected to a DS10A sensor. This should work but would be a kludgey approach. Also I expect there would be mounting problems as well as weather proofing problems for the outside thermostat.
Are there simple thermal switches that would work for this? Any ideas?