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in my previous presentation I used an older model r22 unit that was a tensor those units went out of production back in 2006 and the government began to mandate higher efficiencies in our air conditioning equipment so that they might reduce the cost to the consumer reduce electric consumption in turn reduce environmental impact of generating electricity this isn't something new the original energy efficiency ratings were developed back in 1979 the Department of Energy was the entity assigned to develop these ratings and the original rating was something called the energy efficiency ratio the eer energy efficiency raesha now the energy efficiency ratio was actually something that was pretty straightforward it was BTU consumption divided by the wattage and that would equal our energy efficiency ratio for example if I had a 36,000 BTU air conditioner three ton air conditioner and it used 3600 watts per hour 3000 divided into thirty six thousand would equal to ten in a eer unit this wasn't a very accurate representation of the actual capacity of the unit they didn't take into account warm days cool days spring and fall so they came up with a more efficient way of rating the systems and that was the seer rating and that's the seasonal energy efficiency ratio with the seasonal energy efficiency ratio they took into account the cool spring days some of the warmer fall days so now they would calculate this by the entire BTU divided by the entire wattage over the period of the entire year and that would give me a seer rating ratio these higher efficiency ratings can be accomplished by adding more energy-efficient features to our air conditioning system different manufacturers have different combinations of these improvements on the equipment to achieve the lower wattage consumptions it's all about reducing the wattage consumption probably the first without a doubt the first would be an oversized condenser the oversized condenser can be oversized large enough to where you can actually use a fixed orifice metering device in conjunction with the oversized condenser and achieve the 13 seer minimum rating the oversize condenser will allow the refrigerant to boil at a lower pressure lower pressure equals less work on your compressor less work each will equals lower amp draw lower amp draw equals less wattage consumption the second most popular addition would be the thermostatic expansion valve the thermostatic expansion valve allows the refrigerant superheat in the evaporator to remain constant even during load changes let's say the house is hot we're doing a hot pulldown on the house rather than take hours to remove this extra heat by having a fixed orifice the txb can compensate for this by opening up the orifice hole feeding more refrigerant to the evaporator increasing the capacity of the evaporator and in turn lowering the temperature within the conditioned area at a faster rate thirdly is an electronically controlled motor our back on our evaporator fan motor our blower motor often is used as an electronically controlled module it will modulate its speed so that our fan doesn't move any faster than it has to now that in turn will gives us more control for one thing over there of air that's delivered into the conditioned area and it makes it more efficient because you if you don't need say two amps of airflow within your house to achieve our 450 CFM per ton this can adjust for it another thing about the ECM motor is it can give us some greater control over humidity within instruction another item that can be used to increase the energy efficiency are multi speed compressors no need to move more refrigerant than necessary the multi speed compressors can adjust their speed and adjust their amp drive in accordance with the need of the structures electronically controlled motors for our condenser fans another possibility is to actually use a two-stage compressor the biggie the the great biggie there's a geothermal geothermal air conditioning systems utilized the Earth's heat as a medium to reject and absorb heat through geothermal heat pumps are rather popular they're rather expensive but this would give you your greatest seer ratings seer ratings again range from and currently will range from 13 seer up to 20 seer for the geothermal each component you add will add to the initial cost of the system so really to determine what your customers needs are talk to them find out how much money they're able to spend and match the system to the house