Add in the cost of early system replacement and higher than average maintenance expenses to determine the real financial impact. If the replacement contractor does not provide a Heating & Cooling Load Analysis then consider finding another contractor.ĪPS estimates typical annual wasted energy costs from oversized equipment to be between $60 and $300 per 3-ton unit. Rule-of-thumb is something we use in the field as inspectors, heating and cooling contractors to determine equipment sizing should not use it. As a rough rule-of-thumb you need one ton of air conditioning per 400 to 500 square feet of living space in the Phoenix area. Many factors go into a complete Heating and Cooling Load Analysis to select the correctly sized equipment. It takes a trained expert to determine proper sizing of a cooling unit.
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