Commercial Air Conditioner Calculator

EER (energy efficiency ratio) is the cooling capacity (in Btu/hour) of the unit divided by its electrical input (in watts) at the Air Conditioning and Refrigeration Institute's (ARI) standard peak rating condition of 95°F.

SEER (seasonal energy efficiency ratio) and IPLV (integrated part-load value) are similar to EER but weigh performance at different (peak and off-peak) conditions during the cooling season.

Metric Conversions
1 Ton = 12,000 Btu/h
1,000 Btu/h = 293 watts
°F = (1.8 * °C) + 32
1 Foot = 30.5 cm

This FEMP energy cost calculator compares the energy costs for your selection with the energy cost for the FEMP recommended rooftop units for various energy costs, efficiency levels, size variations, and hours of operation.
INPUT SECTION
Input the following data (if any parameter is missing, calculator will set it to the default value).			Defaults
Condenser Type			Air Source
Capacity	tons		10 tons (To convert BTUs to Tons, divide by 12,000)
Energy Efficiency Ratio	EER		10.3 EER
Annual Hours of Operation	hours		1500 hours
Energy Cost	$ per kWh		$0.06 per kWh
Quantity of Air-Conditioners to be Purchased	unit(s)		1 unit

OUTPUT SECTION
Performance per Air-Conditioner	Your Choice	Base Model	FEMP Recommended Level	Best Available
Energy Efficiency Ratio	EER
Annual Energy Use	kWh
Annual Energy Cost	$	$	$	$
Lifetime Energy Cost	$	$	$	$
Lifetime Energy Cost Savings	$	$	$	$
Performance for Air-Conditioner(s)	Your Choice	Base Model	FEMP Recommended Level	Best Available
Energy Efficiency Ratio	EER
Total Annual Energy Use for Air-Conditioner(s)	kWh
Annual Energy Cost	$	$	$	$
Lifetime Energy Cost	$	$	$	$
Lifetime Energy Cost Savings	$	$	$	$
Your selection of a(n) ton rooftop unit will have a $ energy cost savings per air-conditioner (over its estimated 15 year life expectancy compared to the base model).
Assumptions "Base model" has an efficiency that just meets the national minimum standard for that capacity. Lifetime Energy Cost is the sum of the discounted value of annual energy costs based on assumed air conditioner life of 15 years. Future electricity price trends and a discount rate of 4.1% are based on Federal guidelines. $0.06/kWh is the Federal average electricity price in the U.S.
Disclaimer This cost calculator is a screening tool that estimates a product's lifetime energy cost savings at various efficiency levels. Maintenance and installation costs do not vary significantly among the same product having different efficiencies; so, these costs are not included in this calculator tool. For a detailed life-cycle cost analysis, FEMP has developed a tool called Building Life-Cycle Cost (BLCC). This downloadable tool allows the user to vary interest rates, installation costs, maintenance costs, salvage values, and life expectancy for a product or an entire energy project.

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