Constant Home Comfort

It is a Nightmare to use these people! Who ever want to use them, please read the following carefully.
I have this company installed a Rinnai R94LSI hotwater system, a General humidifier and a Bryant air conditioner in May 2012. Right after the installation, I already found that the air conditioner was placed poorly on the yard and the hot water system was mounted -5 degree tilted, the workmanship is so horrible.
Next day, I've found that the hot water supply is insufficient when two person are using at the same time where the factory claim that it will support four person shower at the same time.

After complainted to the sales manager Kary, he come to my house after one week with another installer Mr. Gao to verify all the problems, Mr. Gao confirmed that the inlet for the water pipe and the gas pipe are too narrow and shall be replaced by a thicker one at the very beginning. The previous installer is a temporarily worker!
Mr. Gao eventually came back in early September to re-addressed everything he has mentioned above.
Next day after he left, all my family member found that, the hot water temperature will become cool after few minutes of shower, you have to turn the valve all the way to HOT in order to have hot water again. It is very uncomfortable, especially in winter.
After two week of confirming this problem, I called the manager Kary again, he advice me to call the installer Mr. Gao directly, after talk to Mr. Gao, he told me that he never has this type of problem, he told me that he will check with the factory and call me back. However he never call me back or show up again.
After one month in mid October, the temperature drops and the furnace turns on, my meter shows that the humidity is 18% only, I went down to the basement to check the system setting, then I discovered that the humidifier is not working at all because it has no water going through the filter. I called Kary again, he told me that he will call Mr. Gao to come back, however he never.
Since then, I called either Kary, Mr. Gao or the reception desk each month, every time their response are the same "will come back tomorrow" !
Over a year now after their first installation, they never and ever shows up again, nor follow up the system.

From this experience, I found Constant Home Comfort is a very small company and lack of management, Mr. Gao is the only technician they have and I believe he is working by job, returns for him has no pay or income. The symptom I have they don't even border to study or consult to the manufacturer.
I just hope that, no one will use this company and suffer like me!