/diy/ - Do It Yourself

>>2442167
He's talking about a package unit. The idea with these is that both coils (the evap and condenser) and the furnace are all located in one big box, usually along with the air handler blower-- whether that's on the roof or beside the building etc etc.
They're a good choice for DIYers in my opinion because all you do is put them on a little pad and run gas, electric, thermostat wire, a condensate drain, and air ducts to and from the unit. You don't have to fuck with the refrigerant or running copper lines to install one. They're also usually fairly pleasant to work on compared to split systems. The rooftop versions often have adjustable air shutters to let in some fresh air into the mix too.