Quote:
Originally Posted by Tx Firefighter
The theory is well above my expertise. I asked Valerie and she said we are 2300 sq/ft. She's lived here for 15 years so she knows the house best. The old unit was also a 5 ton. I can say for sure, there's not too much concern for it short cycling. It runs for a while when it does come on. The house is insulated walls and attic with brick construction. It does often exceed 100 degrees here for a week or more at a time and the old 5 ton unit would put in a full day's work keeping it cool.
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I use to work in the AC industry, in Texas we used a rule of thumb of 400-500 sqft per ton. So, for a 5 ton unit that would be 2000-2500 sqft. The best way to know for sure what size unit to install is to do a heat load calculation. The 5 ton for a 2300 sqft house is very reasonable. I have a 4 ton in a 2000 sqft house and it performs great without short cycling.