There are several sites I have seen over the years that will do the basic calculations your looking for but I don't have any of them saved to favorites or anything to be able to pass them on. Your best bet would be to do a search for something like a HVAC calculator, etc and see what you can find.
I started doing a bit of studying on the HVAC field several years back,one just to learn something new, and two to give myself more options for employeement, if needed, given the economic situation. Thankfully my mechanic work picked back up and as a result I didn't have the opportunity to pursue things too much further.
That said, based on what little I did manage to learn, to do even a fairly accurate assesment of your HVAC needs there are alot of factors involved. They range from the amount of insulation in the walls, to the type and square footage of window glass, to the actual size/cu feet of the house and individual rooms, to the number of doors, to the type and amount of attic space, to the type of foundation/crawlspace, to the climate zone you live in, etc, etc. In other words, whether you understand what they are doing or not, your best bet will be to simply call a professional and let them figure it all out.
You say there are three close to you so I'd call all three and have each one come out and give their own assesment on the situation and then compare the results. All things being equal they should all come up with figures in the same ball park as far as system capacity goes. But if one of the three is way off the mark, just remember, like many other things in life too much or too little of something can be a problem. The same goes for an HVAC system since too much or too little heat, A/C, ventilation and/or airflow has the potential to cause problems ranging from something simple like a cold or hot room to more major problems like condensation buildup in the ventilation system or the structure causing problems with mold or mildew. Not to mention and undersized system will cause excessive wear and tear on the equipment effectively shortening it's life expectancy due to the excessive run time and costing more money to replace the system prematurely. Based on that take the majority opinion and then narrow it down by price, or whatever other criteria you have in mind to make an informed choice. Good luck.
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