The answer will depend on where your home is: I suspect that there will be a big difference between a home in the Arctic and one in the Gulf States. That will determine the range of ambient temperatures. It will also depend on what you consider to be a desirable temperature.
Other factors to consider: insolation and solar gain, insulation and air circulation, whether or not there are other steps taken to lower the ambient temperature. For example, a house in the middle of trees will be cooler than one surrounded by lawns, and that will be cooler than one with concrete all around.
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There is only one way to properly size an ac unit or a furnace. That is by performing a load calculation. This is a process that takes into account the construction features of the home. It is also based on weather data for the specific location of the home. For more information you can click on the load calculation page at http://www.hvac-for-beginners.com
How to calculate spanner size regarding bolts and nuts
You cannot:)
Yes.
2.5 ton