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  3. Home Improvement Monthly Types of Heating Systems: By James Ryan The majority of Ameri

Home Improvement Monthly Types of Heating Systems: By James Ryan The majority of Ameri

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问题                            Home Improvement Monthly
Types of Heating Systems:                                           By James Ryan
The majority of American homes are heated with forced-air furnaces that are most commonly fueled by natural gas but also by electricity, liquid propane, or fuel oil.
AFUE is a measure of how efficient the appliance is in using electricity or fossil fuels (oil or gas) over the course of a typical year. An all-electric furnace or boiler has no fuel loss through a chimney. The AFUE rating for an all-electric furnace or boiler is between 95% and 100%. The lower values are for units installed outdoors because they have greater jacket heat loss. However, despite their high efficiency, the higher cost of electricity in most parts of the country makes allelectric furnaces or boilers uneconomic choices. If you are interested in electric heating, you might consider installing a heat-pump system.
Routine Maintenance:
When was the last time you changed or cleaned your furnace filter? Failing to replace or clean the filter regularly can be costly!
Dust and dirt can work their way into the blower and coil assemblies, reducing the furnace’s operating efficiency and eventually causing damage to the motor. Heating professionals say simple dust and dirt are the cause of almost half of their service calls; most manufacturers recommend changing or cleaning filters at least every other month. (Once a month is best.)
Get an Annual Service Checkup:
An annual service checkup by a heating professional is usually a good idea. The technician will check the flues and temperature settings, examine the heat exchanger for cracks, and check the safety mechanisms on natural gas units. A $50-$100 annual tune-up can reduce your heating unit’s operating cost by three to four percent.
What mostly causes problems with the heating system?
选项 A、Electrical sparks
B、Incomplete combustion
C、Dust and dirty filters
D、Blocked flues
答案C
解析 问导致供暖系统发生问题的主要原因，要在报道中介绍导致供暖系统出问题的原因的部分了解线索。在说明供暖系统的用电管理的第二个项目“Heating professionals say simple dust and dirt are the cause of almost half of their service calls；most manufacturers recommend changing or cleaning filters at least every other month．”中说，供暖系统的大部分问题是因为灰尘和滤器而发生的，因此正确答案是(C)。
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