In Fort Worth Texas, I have 2350 sq. ft. home. Four years ago, I change from two air conditioners (and furnaces) to a Trane Xl19i 5 ton two zoned system. This is a one story ranch style home, with the zones being the living room, den and kitchen on one zone, and the bedrooms (3) bathrooms (2) on the other zone. All the duct work was replaced at the time of installation.
In the four years I have had 13 service calls for A/c failures. Four of these failures required replacing the start capacitors, and or the start relay (start kit). There have been several problems with poorly programed thermostats and "tuning" the main control board.
Tired of worrying about the a/c running when I got home--is it, or is it not?--I have had 3 different companies out to see if they can find the real problem. (By the way, this is covered by a 10 year parts and LABOR warranty from Trane). Everyone says---ducts too small, not enough return air.
OK. Now a Trane dealer wants to move the unit to the attic, turn it on it's side (XV80 upflow furnace) and replace the evap. coil, and redo the duct work and retrun air system.
Question. Obviously some big money involved. Is it worth doing, or should the whole system be replaced, or should we just change the ducts to the proper size and go to plan B (don;t have that yet) for the return air.?
Static test indicated 1.2 inches (?) of pressure. Apparantly this should be .5 or less.
If you need more info, please let me know, I have a weeks worth of info on this system, and all it's parts.