HVAC Problems
I am looking for advice. We closed on a semi-custom build about 3 weeks ago. It has a 2 zone AC system. The upstairs and primary (on the first floor) are on one unit, and the rest of the main floor is on the second unit. The home inspection which was done a week before the closing, so about a month ago, identified that the upstairs unit was not working properly. There was water in the pan and it would not hold temp upstairs or in the primary. We were assured that it would be fixed. Since closing, they have been out to the house 6 times. They changed out the coil, realigned drain lines, and moved a sensor. The system still does not work right. Last night it was 88 degrees upstairs and 77 in the primary. 2 of our 3 bedrooms are very warm. One is way to hot to sleep in.
2 days ago, it was very hot here in NC, and the main floor got up to 77 degrees. I called the HVAC company to tell them the whole house is now hot, and they basically told me that they would do nothing because we were going into the holiday weekend. I was also told that the system is only designed to keep the temp around 75 if it is really hot outside.
On Friday I was told that the coils on this model unit were just determined to be bad, so they replaced a bad set of coils with the same problem. Now they say they will replace the upstairs unit sometime next week.
My frustration is very high. We have not been able to use half of the house for the 3 weeks we have been living here. I have to have an outdoor fan running full tilt blowing air from the living room into the primary just so we can sleep in there.
So here is where I need advice-
The HVAC contractor is a sub to the builder. The builder has been very responsive and sympathetic. He agrees that 75 is not reasonable, but the HVAC company seems to think that 75 degrees is an acceptable target temp. Is that true? It is uncomfortable for me. If not, how do I compel them to put a unit in that will give me temperature authority over a comfortable range? Shouldn't this have been part of the original engineering design?