The HVAC Calc program is good, and it works, but you had better pay attention to the "sensible" and "latent" loads, not what the program tells you for "tons".
Originally posted by nathan9999
I would strongly encourage you to buy the HVAC-Calc program featured on this site and spend a few hours performing a load calculation.
I live in Bakersfield, CA which is very similar to Sacramento's weather. My 3139 new home comes in at 4.5 tons based on the calculation. The original plan called for 6 tons. I'll be installing a 5 ton unit.
You might be surprised at the results of a thorough heat gain calculation. You might also surprised how many contractors profess not to believe in the calculation, or at least refuse to perform a calculation.
A 5 ton condenser is not going to give you 60k btu of sensible cooling capacity.
Proper Prior Planning Prevents Piss Poor Performance
"There is hardly anything in the world that some man cannot make a little worse and sell a little cheaper, and the people who consider price only are this man's lawful prey. It's unwise to pay too little.
When you pay too much, you lose a little money -- that is all. When you pay too little, you may lose everything, because the thing you bought was incapable of doing the thing it was bought to do.
The common law of business balance prohibits paying a little and getting a lot -- it can't be done. If you deal with the lowest bidder, it is well to add something for the risk you run. And if you do that, you will have enough to pay for something better."