Are BTU Calcs reliable -- should I oversize my system?
I am from Pennsylvania and have been retired for many years so let me give you my thoughts on how I would size your system. If you choose the smaller 2 ton system the only time you would notice that it may be undersized would be on extremely hot days when the inside temperature would rise above the set point. I have always thought that a smaller system would be better overall since it would better control the humidity during the milder days of a normal cooling season. On an extremely hot day, the inside temperature may rise slightly but that is a trade-off I could live with. I would ask my neighbors the size of their units and compare the construction of their homes to mine to get a good idea of the needed A/C size.
This is an addition to my above statement, Years ago, we would up-size the &quot;A&quot; coil to the next size, say a 3.5 ton coil with a 3 ton A/C unit. This would yield slightly more A/C cooling capacity and would give the coil more surface area to remove more humidity. Now to be honest, I have not sized or installed an A/C unit in many years so I would have to consult an HVAC company to make sure that I am correct in my statements. my 2 cents