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Know Your HVAC TerminologyIn order to converse with air conditioning experts, it is essential to be familiar with basic terms used in the description of the various types of cooling equipment. The following questions illustrate some of the key terms that are more commonly used and confused.
1. What is a BTU? 2. What is the Difference Between EER and SEER? EER = BTUs of Cooling @ 95 F / Watts used @ 95 F In the case of a 10 EER, 2 ton air conditioner: 10 EER = 24,000 BTUs Out / 2,400 Watts In For the same size unit, but rated at 12 EER: 12 EER = 24,000 BTUs Out / 2,000 Watts In or 20% more efficient. If you want to calculate kWh, just multiply the "Watts In" by the number of hours that the air conditioning is running. If you'd like to convert watts to kWh, simply divide by 1000. SEER (seasonal energy efficiency ratio) is a measure of efficiency over an entire cooling season, as opposed to a single outdoor temperature. Residential units are almost always rated in SEER. SEER came into use as a more practical measure, since the temperature outside is not always 95 F. Also, the denominator is in watthours, not in watts as is the case for EER. The same relationship holds ... a higher SEER means the system is more efficient. SEER is the total amount of cooling the air conditioner will provide over the entire cooling season divided by the total number of watthours it will consume or: SEER = Seasonal BTUs of cooling / Seasonal watthours used 3. What is a "Ton" and How is it Used to Define Air Conditioning Capacity? Typically residential central heating systems provide from 2 to 5 tons of cooling. Commercial rooftop units are typically 3 to 20 tons each. Chillers can range from 15 tons up to 1,500 tons. 4. What is COP? For a heat pump:
For a chiller:
5. What is Relative Humidity? Take the Next Step Air conditioning is usually the largest part of a business' energy bill. And, if you have old or inefficient cooling equipment, your energy costs can be even higher. FPL has many EnergyEfficient Cooling & Heating Incentives. Go to FPL.com to learn more. 

