I started a thread about a couple of days ago. Since I am installing a new system for the home, I am starting a new thread. If this is a problem, let me know. Please help me to find the right this time.
1. I have the heat load calculation with me, but seems like it could be wrong because it was done by a dealer.
2. This is Atlanta area.
3. Cathedral Ceiling.
Below is what a Trane dealer proposed.
For the downstairs,
Trane 60KBTU Furnace and 2 Ton A/C.
For the upstairs,
Trane 60KBTU Furnace and 3 Ton A/C with a new return vent made on the hallway of the 2nd floor.
He measured the house; upstair and downstair. But he did not do heat load calc. He proposed this based on measurement and houses in the surrounding neiborhood. After he came back to the office, he said that he did heat load calc and consulted this case with an install manager.
I asked him if 60KBTU is oversized. He agreed that it is oversized, but the one below in Trane line is 40KBTU. He said that is too small for the house and the blower capacity is not big enough.
I asked him why he suggested 2.5 Ton for the upstairs. He said that the upstair gets heated and needs more cooling especially in the cathedral ceiling. And since there are only four return vents, additional one needs to be created to accomodate 2.5 Ton A/C.
He also suggested to change to the supply plenum for better air distribution. He pointed out that the air distribution is not good because the original one is not properly installed.
Seems like this guy is the best I ever met. He kind of meant that the heat load calc is not always right because a lot of contractors sometime don't enter right information.
Do you think what he suggested is correct? Does it make sense?
Looking at the heat load calc the previous dealer created for me, something does not make sense to me. The upstair heat gain is smaller than the one downstairs. Heat gain on the 2nd floor has to be bigger, doesn't it?