I recently had a new A/C and Furnace installed in my split entry home. I can't get the thermostat to get below 72 unless it is well into the middle of the night even when the set tempature is well below 70. The unit runs essentially all day and typically cannot get below 74. This is actually better then when it was first installed a few weeks ago. Initially, the thermostat would read 78 on a day that was barely 80. The service guys indicated that one of the techs put too much PURON in the unit. After 2 1/2 hours they indicated that reducing this level would solve the problem. It did make it cooler but now it still runs all day and averages 74-75. When the sun hits the front of the house from 6PM until dark, it can go even higher especially if there are more than two people in the house.
I am very dissapointed by this and wondered if there was any help out there or something I can ask the service guys who typically say that 75 is an acceptable temp.
My old unit was from 1987 and was the same nominal ton (2 ton - 24,000 BTU) so you would assume that a 2005 unit would perform the same if not better. My old unit could easily get down to 70 and sometimes under.
The new units are a Trane XV80 and a 2 ton SR12. I live in Pittsburgh, PA (NorthEast USA). We have had some hot days at 85 and decent humidity. If my unit can't handle these days in June, what is it going to do in August when it will be reaching 90 and 100% humidity!
My house is a split entry and is about 1,500 square feet. The outside of the house is 42' x 26.5'. It is a split entry, so the game room 10 x 20 is essentially negligable since the rest of "first floor" is garage.
The service guy is coming out again soon and of course the highs in the next few days are below 75 so they are not going to see the problem. I went with the place because they were reputable and are part of the @Home services from Home Depot. But they are giving us lines like "need more returns", "The A/C is designed to cool 15 degrees less then outside", and "75 is an acceptable tempature".
During the sales process, I asked the sales guy a number of times if I needed to bump up the tonnage, need more returns, etc and the pitch was very convincing that the new unit would be everything I could ask for since it would be 15 years newer technology. They even added a return in my game room, so the song and dance about not enough returns is bull. Plus, my old unit was able to do 70 and did not have to run all day. The new unit runs 16+ hours a day and can't get it to 72 unless that is what the temp is outside or less. If it matters, the tech guy indicated that it was "68 degrees on the coil".
I have seen on some threads doing temp measurements at the vents and returns, what are the expected values?