Doing a home inspection that involves calculations of heat gain appropriate for cooling capacity may not be possible. But an external inspection on the same will give you an idea. For example, the appropriate calculation is 36,000 BTU. This calculation will not be possible to do at home, but an external inspection will not only give you this information, you can also know the absence and presence of cooling sources of the building.
Cooling capacity requirement for your air conditioning repair and replacement:
For cooler climates as in the Northeastern United States the capacity is one ton/400 sq .ft. for commercial and one ton/500 to 1000 sq .ft. for Residential units.
For Space Pak Systems, one ton/400 to 800 sq .ft. is required.
A 3000 sq .ft. house needs a 5-ton unit. And in case of supply outlet count – An estimated 100 cfm @ 10 outlets = 1,000 cfm . Which means 2.5 tons is needed.
Try to stay away from BTUs of capacity than you actually need
An oversized A/C will have too much capacity and will rapidly drop the indoor temperature to such extent that the cooling cycle will be very short to allow sufficient decrease in the humidity level. It is true that indoor comfort is a balance between temperature and humidity.
Moreover, when the A/C will be turning on and off more frequently, the comfort level will decrease and this will also be hard on the equipment. Hence, it reduces its life span.
Turning the motor on and off frequently can damage the equipment and will result in expensive air conditioning repair and replacement.
If you notice that the on and off is unusually short, or the humidity level drops, you need to go for an air conditioning repair.