We use a high efficiency cooling and heating system from Daikin.
The key for energy independence really stems from the heating end here. All electric heating in Texas works well on most systems until it starts getting cold. Once auxiliary or emergency heat kick on heat strips are needed and this uses a lot of power. Daikin fit heat pumps will heat at 100% down to -10 degrees. Builder grade heat pumps need heat strips under 30 or even just under 40 degrees. Very very difficult to back up 15-20 kW heat strips.
Most signal stage HVAC units we suggest changing out. We are willing to work on all units and can help maintain them to the best of our ability.