There really is not a whole lot of difference. They are both manufacturers of many brands. Their warranties are about the same. Really with either brand you are mostly paying for the name.
a central air conditioning system contains an indoor unit and outdoor unit. the condenser extracts air from the indoors moves it out and brings cool air through the furnace which then distributes it...
everyones opinion varies check the warrenty goodman has afree 10yr parts and they don t cost as much as the big name brands because they don t advertise
there's a few ways to do this.. either you can go buy a leak detector or the cheap way like most of us do it is get a squirt bottle put a dish soap in it and then fill it up with water. just enough...