An evaporative cooler (AKA "Swamp" cooler) for those who aren't familiar are devices used in dry climates that basically suck dry air through a sponge like material saturated with water. Evaporation in turn cools the air which is then pumped in to the house to cool it. They use about 10% of the electricity of a traditional air conditioner.
The problem: there are no commercial controllers that intelligently juggle both the evap system and the furnace at the same time.
So, when you feel cold you turn on the heat. As it starts to heat up the evap cooler you forgot to switch OFF (Or perhaps more accuratley your wife :fearful:) turns on to try and cool it down.... and they both go to town battling each other until you wake up in the middle of the night to find out it is either freezing or muggy and hot as hell. (DAMHIK).
Annnyyyyway...... LOL, this sounds like a great Arduino project.
The cooler is directly controlled via 120V AC and has Fan High, Fan Low and Pump feeds. The furnace I think has the usual 24V (AC I think?) on/off circuit.
Unless I am missing something basic, an Arduino, a temp sensor and 4 SSR's and that should be about it? I Haven't used SSR's before... any caveats to watch out for? (I am comfortable wiring 120V AC circuits.)