Over the past few decades, temperature has been slowly getting hotter in Texas. Many homes that were built years ago were not built to ventilate or be insulated to handle these extreme heats. Therefore, the AC system is cooling, but the home is struggling to reach the optimal temperature. 

This is why we suggest tenants :

1) Change filters

2) Keep debris from outside unit

3) Put up knockout curtains or blinds to reduce window 

4) Use fans

Homes are not designed to withstand consistent 100 degree plus days so the system will seem like its not a comfortable temperature. We can try to find a solution, but it may not be just the AC unit or it may be a function of the home, location, and some of the other factors noted above. 

https://www.aaaheatingandcoolinginc.com/why-isnt-my-house-cooling-down/