what is the most reliable and good central ac/heat unit?

I like trane units. I would call them and ask them if they have one for 2800 square foot home but I would get it for more square footage. That is just me. I have been using trane units for more then 26 years. Our old house we put one in for more square footage then we needed. The house stayed very cold in the summer. I loved it. This house we put one in and we put for what they recommended. The house is not as cold as I would like. I feel we should have gotten it for more square footage. That my feelings. Once you get a new ac/heat unit make sure you have them check it at least every two years. Make sure you change the filter when it needs it. The unit will last you years. This unit we have now for 20 years.