January 2006 Edition

New Air Conditioner Efficiency Requirement For 2006?

We are planning to replace our air conditioner next spring and understand there is a new requirement. Can you fill us in on the details?  
According to Frank Johnson, the president of Robertson­Morrison Inc. in Ann Arbor, Michigan, the U.S. Department of Energy has man­dated a change to the minimum efficiency of central air conditioners.

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This letter is intended not to alarm but instead to provide background information to allow informed decisions based on the new regu­lations. The regulations impact central air conditioners and heat pumps up to 5 tons of capacity. At this point in time, particular focus should be on air conditioning con­densers that are reaching the end of their effective life, which is typically l5 to 17 years. Effective January 23, 2006, manufac­turers will be allowed to produce only equipment that meet the new minimum rating of 13 SEER (SEER is the Seasonal Energy Efficiency Ratio). This is a 30 percent increase relative to the current minimum requirement of 10 SEER. Air conditioning units that are less then 13 SEER can be installed until the available stock of those units is depleted.
In order to achieve the higher efficiency requirements, the manufacturers will be increasing the coil surface areas to improve the heat transfer effectiveness of systems. The outdoor condensing units will be up to twice the size of the current 10 SEER units. In addition, the indoor evapora­tor coils will increase in height by 5” and require a thermal expansion valve to meter the refrigerant. The new 13 SEER units will not only require more copper, aluminum and steel, but also the system will utilize 40 percent more refrigerant
It would also be worth considering chang­ing to a system that utilizes a new synthetic refrigerant to avoid the increased service costs related to the 65 percent reduction in R-22 production that begins in 2010. In addition, production of R-22 Freon based air conditioning equipment will be halted in 2010.
We’ve put together a list of key points from a variety of sources:
• The cost of installing 13 SEER systems will be considerably more expensive than the current 10 SEER systems. When con­sidering that the indoor evaporator coil also needs to be changed, the price approaches a 50 percent increase.
• In some instances, there may not be physical room in existing mechanical rooms to install the taller evaporator coils. Fan coil sys­tems will require a complete indoor unit/air handler change.
• If a matching indoor evaporator coil is not installed, not only will the installation not meet the 13 SEER mandate (which will likely become an issue with local inspec­tors), but it also could cause premature compressor failure to occur.
• The larger indoor evaporator coils will create more air resistance. In some exist­ing marginal airflow systems, a new fur­nace or air handler could be required.
The outdoor condensing units will be up to 110 percent larger. For multiple groupings of condensing units, this could add further complications and costs. The larger size of the components will also impact costs due to increased ship­ping (108 condensing units per truckload vs. the current 342 units), warehousing and handling costs.
The manufacturers has phased out produc­tion of the current units in the second and third quarters of 2005. All units manu­factured after January 23, 2006, must be 13 SEER or above.
Apartments and condos that use the through the wall” type of pack­aged HVAC units (Magic Chef, Armstrong, Magic Pak) have been granted an excep­tion to 2010. The size impact when this type of unit is required to meet higher energy efficiency requirements will be severe, as the current wall openings, will no longer be large enough. In addition, most of these units are located in very confined mechan­ical rooms. A planned replacement of these units over the next 5 years would be a wise option, particularly if the existing units are approaching 15 years of age.
The various manufacturers are predicting shortages in 10 SEER equipment availability in the second half of the year. They will be retooling their plants to switch current lines over to 13 SEER production to meet the January 23, 2006, DOE deadline. Bryant is informing us that “last call” orders for 10 SEER units was the end of June 2005.

Source: ASHI Reporter October 2005. 


No Soffit Vents?

I'm reroofing my house and would like to add more attic ventilation. My problem is the eaves do not overhang the house and there is no soffit ventilation.
Since you are reroofing, now is the time to install additional ventilation. One product designed to meet your situation is Air Vent's vented drip edge. Air Vent's Pro Flow™ Vented Drip Edge combines venting with a drip edge and is used to provide intake ventilation on homes with little or no soffit area.

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The vent provides 9 square inches of net free area per linear foot. You will need to make sure you have a  inch air space between the fascia board and the roof sheathing for proper air flow. Also, add continuous ridge vents to complete the system.

Source: www.airvent.com


If you have a question, change of address, comment, home tip or would like to send Home Tips to your clients, send your letter to Home Tips, Christian Building Inspectors, Inc., 3697 Habersham Lane, Duluth, Georgia 30096. You can E-Mail your questions to us at rodharrison@christianbuildinginspectors.com. We reserve the right to edit questions for length.


 Quote Of The Month

"I look forward to a future in which our country will match its military strength with our moral restraint, its wealth with our wisdom, its power with our purpose."

John F. Kennedy


A Tip Of The Hat To:

Honor Berry

Berry Realty Company

1513 Oak Grove Road

Decatur, Georgia 30033

**** Thank You****


 

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