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27 squares is equivalent to 2700 square feet. Measure square area by multiplying length by width of your entire roof. Add all the areas together for total square feet. Take the square feet and divide by 100 to get squares. 3 bundles of shingles to make one square with 5 inches of exposure on the shingles. For every 33 feet of ridge you will need one bundle of three tab shingles. Each bundle of shingles has 27 shingles so that is 81 single tabs at approximately 5 inches each, 405 inches of run or 33.75 linear feet. At current shingle prices near $21 per bundle that will cost you about $1700 just in shingles. #15 roll of felt is 4 squares at about $20 per roll. One box of coil nails will usually cover 18-20 squares. Any other calculations and you are on your own.
Typically needs "A" coil atop furnace in ductwork, large vapor and small liquid copper lines running between a-coil and external (outside) condensor/compressor unit, 220 V at compressor end, and a professional to silver braze the commpr connections, evacuate the system, and install the refrigerant.The all you need is a thermostat.
Installing a 3 1/2 ton condenser on a 3 tr evaporator will not function properly. There isn't enough evaporator coil surface area to absorb heat and vaporize refrigerant liquid for its return back to the condenser compressor. What can be done is a 3 ton condenser unit with a 3 1/2 evaporator coil.
It depends on the size of the coil and the burn rate.
The length of one coil can vary significantly depending on the diameter and spacing of the coil. For instance, a coil of wire with a diameter of 1 meter and 10 turns would have a length of approximately 3.14 meters (using the formula for the circumference of a circle, ( C = \pi \times d )). To determine the exact length of a specific coil, you would need to know its dimensions.