Thanks for viewing my post. I have had previous post on this site regaurding this issue. I used the manuel J short form at
and figured out that my ac unit is the right size.
The house will not cool to 75 on a 95 degree day. Today the ac contractor came out and "trouble shooted the problem." It was the tech supervisor. I asked to get a copy of the manuel J load calc so I could see it and he told me "it wasn't allowed to leave the office." Does this seem normal? Is that so secret? I believe they have something to hide. Based on the manuel J short form my 2.5 ton ac should be big enough for my 1700 sq foot house.
Next they went up to the attic and inspected the duct and took temps. "Oh you are getting 20 degree drop across the coil its working" said the guy. "you have no leaking ducts either." Next he took temp reading at the thermostat and sad it was reading normal. Then he took readings in the center of the room and said "they were 77-75 between the room's even though the termostat is reading 80". I beileve they are that temp because cool air is blowing in the room and from my measurements as soon as you turn the ac off those numbers jump up.
Next here is where he starts getting squirly. He took the temps at the vents (Well 4 of the 12 untill the one in the kitchen was too high to reach and he said he doesn't know what it is accomplishing anyway). Having previously mapped out the house with my $10 digital themometer I knew which vents where having a loss of cooling and I should him my map. The worst case is 71 degree at the vent when the pleneum has 60 degree's.
I told him that I believe that this is a big loss of efficiency and asked about the big drop. He said,"ah I don't know if that is normal but your room's are still 77 degree's) He then said he would take it to the designer's and let them look at it.
Now this is what pissed me off!! Joe blow ac guy was asked if he could measure how many CFM's where going into the return air and he said he could but he didn't have the equipment with him.
My AC will not get down to 75 on a 95 degree day. I believe they have designed the duct work wrong. The attic may not be venting properly.
Who should I get to confirm all my nightmare's. Obviously the contracter isn't going to admitt to anything?
I found a guy that is an energy star inspector and does Manuel J load calc's. Should I hire him or should I hire a regular residential home inspector?