Please please help. I had an old 3 ton heat pump that was not cooling all that well (in certain parts of the house, away from the air handler) but did cool the other half of the house just fine and most important: it always kept the humidity level in the house between 45 and 50%, no matter how hot and humid it was outside.
I did all my research and hired what I thought was the best contractor in my area to install new Trane system (which I heard they changed the systems this year), which I have always trusted. The company recommended a 4 ton system. FWIW I have a 1950s ranch that is about 2000 square feet and I live in Florida. Note: The house is very tight despite its age, etc. Well, the new system is shooting massive amounts of cold air through the house (compared to old system) but the humidity level will not decrease below 58%. I have to keep the thermostat at 73 in order to keep the humidity at 58%. Which is freezing. I used to be able to have the thermostat at 77 and the humidity was in the high 40s. Because the house keeps the temperature inside well, the new AC does not turn on unless I turn the temperature down low. If and when it does turn on it is for a short period of time, less than 10 minutes (then again temp outside is low 70s). Btw, fan speed was lowered by the technician and situation is the same. It's just cold and clammy in my house.