re: Transfer switch/interlock, come learn me something

Will depend on your panel. Get an electrician to come out or post pictures of your outside and inside panels here and someone can point you in the right direction.

My house has a weird panel/sub panel setup where the “main” is outside and houses main breaker and ac breaker, the subpanel is clear across the house inside and has all the appliance/light breakers. Electrician had to add another panel that branched off my main outside, left the main breaker in its original location and added a secondary main with the ac breaker and an interlock to switch to generator power + a 50amp input. Cost me right around $900 installed.

With this setup I can run lights, fridge, etc and 2 5000btu window units on a Firman TriFuel running natural gas. I’m right around $2k all in.