Hi all, I have two questions.

1 - I've just installed a goodman 3 ton air handler in my attic for ac only. I'm up to wiring the thermostat. It seems the thermostat wires are just sticking out of the unit through a rubber grommet. There's a blue, green, red, white, and brown. I have 18g 5 wire and my plan is to connect the blues together including the one from the condensor, my reds together, and my greens together. The yellow from the condensor do I just connect that straight to the thermostat since there is no yellow wire on the handler? Also, what's the neatest way since I don't want splices and wire nuts outside of the unit?

2- I took off my old heat thermostat. It's a 24v thermostat, but it looks like somebody just spliced 24v wiring to high voltage 110v wiring in the junction box with wire nuts. I thought there had to be a transformer in between? It's worked since I lived here for 9 years but if it's wrong I'd like to fix it now.

Thank you,

Ryan