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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.
The word "measure" in Paragraph 2, Line 1, is closest in meaning to
选项 A、determination
B、gauge
C、calculation
D、sum
答案B
解析 含measure的句子的意思是“AFUE是测定一年中使用电或化石燃料(石油、天然气)的器具的效率的单位”，measure在上下文中用于“单位；标准”之意。因此意为“标准”等的gauge是正确答案。
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