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I recommended a 2 ton unit because a person or person's will be using it as a WORK shop, usually doing some type of WORK...... Most people will also not want to leave this area as a air conditioned space throughout the day they would usually be turning on the unit when they get home and want to work. The extra btu's will cause a faster drop in temp and will make up for the amount of Infiltration that a work shop would have. also you have to take into account any power tools, freezers etc that may produce heat in the room.
Your second comment shows that you understand nothing about air conditioning..... sorta like my wife and cars (you turn the key and it goes He He....) yeah I was referring to a properly designed and maintained system... a hot house will cause higher head pressures and higher amp readings on your compressor.... also discharge air temp will not drop to optimum until the room cools down. What you hope to achieve with a properly designed system is a 10-20 degree drop from supply to discharge air. In this respect, if your house is 110 degrees at 5:30 when you get home from work, you can look at a discharge air temp of no cooler than 80 degree discharge air. The unit will have to run considerably to make the discharge air temp drop. If you have any larger of as split than this you risk having your evaporator freeze up. Dirty filters, clogged coils and low refrigerant will also cause these problems.....
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