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Residential or Commercial Professional Service and Installation of Furnaces, Air
Conditioners, Package Units, Evaporative Coolers and Ductless Mini Splits
Frequently Asked Questions
• What do rating numbers mean?
• What is a SEER?
• What does HSPF stand for?
• What does AFUE stand for?
• Should outdoor units be covered in winter?
• Should a thermostat be set to "auto" or "on"?
• Can shrubs or flowers be planted around an outdoor unit?
• If an outdoor unit needs replacing, should the indoor unit be replaced too?
• How do I know what size unit our house needs?
•Is sound an issue with new equipment:
• What is the difference between a split system and a package unit?
What do rating numbers mean?
The U.S. government requires an efficiency rating of all air conditioning and heating equipment. The
rating reflects the percentage of energy used efficiently, with a high rating indicating high-efficiency.
The next two topics address this issue in greater detail.
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What is a SEER?
There are special names for the efficiency ratings of various types of equipment. Air conditioning
equipment is rated by the Seasonal Energy Efficiency Rating, or SEER. The higher the SEER rating,
the more efficient the unit. The higher the SEER rating, the less electricity it uses. WARNING: There
are actually some contractors ou there that think the higher the SEER, the colder the air it puts out.
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What does HSPF stand for?
There are special names for the efficiency ratings of varying types of equipment. Heat pump
equipment in the heating mode is rated by the Heating Seasonal Performance Factor, or HSPF. The
higher the HSPF rating, the more efficient the unit. Again, the less energy it uses.
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What does AFUE stand for?
There are special names for the efficiency ratings of various types of equipment. Gas furnaces are
rated according to their Annual Fuel Utilization Efficiency, or AFUE. The higher the AFUE rating, the
more efficient the unit. The typical furnace is 80% efficient. There are furnaces made now that are
up to 98% efficient (they burn more gas efficiently).
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Should outdoor units be covered in winter?
No. Heat pumps operate year-round and should never be covered. Similarly, air conditioners that
operate seasonally are built to withstand an outdoor environment and should not be covered.
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Should a thermostat be set to "auto" or "on"?
Preferably auto. That way, the fan operates only when the temperature requires it. This is the most
used and the most efficient setting. However, there are advantages to using the "on" setting. Air is
constantly filtered through the unit's air filter, and the constantly circulating air results in an even
temperature throughout the house.
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Can shrubs or flowers be planted around an outdoor unit?
Yes. However, we recommend that plants be no closer than 18 inches to the unit. This allows for
plenty of room for air circulation in and out of the unit. Without this room for air circulation, the unit
could overheat, resulting in a premature need for service.
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If an outdoor unit needs replacing, should the indoor unit be replaced too?
Yes. All air conditioning and heating units are designed to operate as a complete, matched system.
The efficiency rating is based on the entire system. Replacing the entire system ensures the system
will be reliable and efficient.
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How do I know what size unit our house needs?
Ask your HVAC dealer. He will consider many factors before making a recommendation. Factors like
… size of the house, climate, the number and type of windows installed, insulation, and even the
number of people living in the house. They should perform what is called a Manual J Load
Calculation.
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Is sound an issue for heating and air conditioning?
The louder the better doesn't necessarily hold true for heating and A/C equipment. Heating and
cooling equipment should offer maximum comfort with minimum noise. Fortunately, today's
technology has enabled manufacturers to produce air conditioners and heat pumps that are not only
highly efficient, but also exceptionally quiet. Especially the new Rheem line. Loud heating and cooling
equipment contribute to sound pollution. Although no financial savings are tied to lower sound levels,
the sound rating of a cooling system can have a considerable effect on comfort and enjoyment of
your home. The sound level of an air conditioner or heat pump depends on a variety of factors. The
age of the unit and whether the compressor is insulated or not can contribute to the amount of
noise it makes. You also need to choose a contractor that will look at your duct system. Ducts that
are undersized (both return & supply) can create noise. Ask your contractor if your ducts are sized
correctly. They should measure and run some calculations before answering. Although most heating
and cooling systems manufactured today are quieter than ever before, it's a good idea to compare
sound ratings when shopping for a new air conditioner or heat pump, particularly if the equipment
location is near bedrooms or living rooms. Great differences in the sound levels of products on the
market today can make all the difference in just how comfortable you can be at home.
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What is the difference between a split system and a package unit?
A split system uses indoor and outdoor components to provide a complete home comfort system. A
package unit or self- contained unit requires no external coils, air handlers, or heating units.
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