Since my Frigidaire has Auto-restart and I don't like getting up at 8am to turn down the onboard tstat, nor being at home at 8pm to turn it back up, I wired it to a programable tstat. $20 at Lowes.
Then from the HVAC store I got a Contactor (2 pole, 24v coil)$15, Transformer (24v)10$, and...