空調(diao)起動(dong)與否，對汽車的動(dong)力性和(he)經濟性的影響不一樣。

    在動力性方面(mian)(mian)，汽車(che)從靜止起(qi)步加(jia)速(su)到(dao)某一速(su)度時，使用空(kong)調(diao)(diao)(diao)的汽車(che)總(zong)有一種(zhong)(zhong)反(fan)應遲滯(zhi)的感覺，失去了不(bu)用空(kong)調(diao)(diao)(diao)時的那(nei)種(zhong)(zhong)爽快。不(bu)過在高速(su)行駛時倒感覺不(bu)出來(lai)。在經濟性方面(mian)(mian)則表(biao)現(xian)為使用空(kong)調(diao)(diao)(diao)較不(bu)用空(kong)調(diao)(diao)(diao)時的油耗(hao)明顯(xian)增(zeng)大。

    那么，汽(qi)(qi)(qi)(qi)車(che)(che)(che)空(kong)(kong)調要(yao)占用多(duo)(duo)大的功率(lv)呢?用電機(ji)驅動的家用空(kong)(kong)調每(mei)獲得(de)1冷(leng)噸(3.5kN)的制冷(leng)量只(zhi)需(xu)消(xiao)(xiao)耗(hao)1馬力(約0.735kW)功率(lv)，而(er)汽(qi)(qi)(qi)(qi)車(che)(che)(che)空(kong)(kong)調每(mei)產生l冷(leng)噸的制冷(leng)量則需(xu)要(yao)消(xiao)(xiao)耗(hao)2馬力的發動機(ji)功率(lv)。這(zhe)是因為(wei)為(wei)了節省汽(qi)(qi)(qi)(qi)車(che)(che)(che)的空(kong)(kong)間，汽(qi)(qi)(qi)(qi)車(che)(che)(che)空(kong)(kong)調冷(leng)凝器通常設計得(de)小(xiao)些，冷(leng)凝溫度較(jiao)高，而(er)使(shi)用環境溫度又(you)比較(jiao)高，這(zhe)樣(yang)為(wei)得(de)到相同的制冷(leng)量，汽(qi)(qi)(qi)(qi)車(che)(che)(che)空(kong)(kong)調必(bi)然較(jiao)家用空(kong)(kong)調消(xiao)(xiao)耗(hao)更多(duo)(duo)的功率(lv)。不(bu)同型號(hao)的汽(qi)(qi)(qi)(qi)車(che)(che)(che)空(kong)(kong)調系統消(xiao)(xiao)耗(hao)的功率(lv)值(zhi)是不(bu)相同的，一般隨制冷(leng)量的增大而(er)增大，但空(kong)(kong)調對(dui)汽(qi)(qi)(qi)(qi)車(che)(che)(che)動力性(xing)的影(ying)響基本上在10～15%。具體表現在汽(qi)(qi)(qi)(qi)車(che)(che)(che)的加(jia)速性(xing)能，就是加(jia)速時間變(bian)(bian)長了，爬坡(po)能力變(bian)(bian)小(xiao)了，車(che)(che)(che)速下(xia)降(jiang)了。不(bu)過由于車(che)(che)(che)速較(jiao)高時，空(kong)(kong)調消(xiao)(xiao)耗(hao)的功率(lv)較(jiao)空(kong)(kong)氣阻力消(xiao)(xiao)耗(hao)的功率(lv)小(xiao)得(de)多(duo)(duo)，這(zhe)就使(shi)汽(qi)(qi)(qi)(qi)車(che)(che)(che)的車(che)(che)(che)速下(xia)降(jiang)不(bu)大，甚至幾乎沒(mei)什么影(ying)響。

    使用(yong)空(kong)(kong)(kong)調(diao)(diao)汽(qi)(qi)(qi)(qi)(qi)(qi)車(che)(che)的(de)經濟性(xing)又如何呢?一(yi)般(ban)汽(qi)(qi)(qi)(qi)(qi)(qi)車(che)(che)空(kong)(kong)(kong)調(diao)(diao)系統(tong)總(zong)重(zhong)(zhong)達30～50公(gong)斤，汽(qi)(qi)(qi)(qi)(qi)(qi)車(che)(che)自重(zhong)(zhong)增(zeng)加了(le)(le)，使汽(qi)(qi)(qi)(qi)(qi)(qi)車(che)(che)的(de)燃油(you)(you)(you)(you)(you)消耗(hao)(hao)(hao)也增(zeng)加一(yi)些。在市(shi)區行(xing)(xing)(xing)駛(shi)的(de)小型(xing)轎(jiao)(jiao)車(che)(che)，由于(yu)空(kong)(kong)(kong)調(diao)(diao)自重(zhong)(zhong)的(de)增(zeng)加，每(mei)升(sheng)(sheng)汽(qi)(qi)(qi)(qi)(qi)(qi)油(you)(you)(you)(you)(you)少(shao)行(xing)(xing)(xing)170米(mi)(mi)，中型(xing)轎(jiao)(jiao)車(che)(che)少(shao)行(xing)(xing)(xing)40米(mi)(mi)。總(zong)的(de)說來影響不(bu)大。但如果起動了(le)(le)空(kong)(kong)(kong)調(diao)(diao)系統(tong)，由于(yu)壓縮機(ji)需要(yao)消耗(hao)(hao)(hao)的(de)功率，空(kong)(kong)(kong)調(diao)(diao)風(feng)扇還要(yao)工(gong)作，這都(dou)要(yao)耗(hao)(hao)(hao)用(yong)發動機(ji)動力，每(mei)升(sheng)(sheng)汽(qi)(qi)(qi)(qi)(qi)(qi)油(you)(you)(you)(you)(you)所行(xing)(xing)(xing)駛(shi)的(de)里程就少(shao)得更多(duo)。如，當氣溫在30℃左右時，打開空(kong)(kong)(kong)調(diao)(diao)系統(tong)，汽(qi)(qi)(qi)(qi)(qi)(qi)車(che)(che)以每(mei)小時32公(gong)里的(de)速度行(xing)(xing)(xing)駛(shi)。則每(mei)升(sheng)(sheng)汽(qi)(qi)(qi)(qi)(qi)(qi)油(you)(you)(you)(you)(you)少(shao)行(xing)(xing)(xing)1000米(mi)(mi)；若時速為(wei)80公(gong)里，則每(mei)升(sheng)(sheng)汽(qi)(qi)(qi)(qi)(qi)(qi)油(you)(you)(you)(you)(you)少(shao)行(xing)(xing)(xing)840米(mi)(mi)。不(bu)過(guo)不(bu)同車(che)(che)型(xing)每(mei)升(sheng)(sheng)汽(qi)(qi)(qi)(qi)(qi)(qi)油(you)(you)(you)(you)(you)少(shao)行(xing)(xing)(xing)里程也不(bu)一(yi)樣。如假定(ding)空(kong)(kong)(kong)調(diao)(diao)使油(you)(you)(you)(you)(you)耗(hao)(hao)(hao)增(zeng)量均(jun)為(wei)10％，則百公(gong)里油(you)(you)(you)(you)(you)耗(hao)(hao)(hao)為(wei)6升(sheng)(sheng)的(de)微(wei)型(xing)轎(jiao)(jiao)車(che)(che)，每(mei)升(sheng)(sheng)汽(qi)(qi)(qi)(qi)(qi)(qi)油(you)(you)(you)(you)(you)少(shao)行(xing)(xing)(xing)達1520米(mi)(mi)；百公(gong)里油(you)(you)(you)(you)(you)耗(hao)(hao)(hao)為(wei)8升(sheng)(sheng)的(de)中型(xing)轎(jiao)(jiao)車(che)(che)，每(mei)升(sheng)(sheng)汽(qi)(qi)(qi)(qi)(qi)(qi)油(you)(you)(you)(you)(you)少(shao)行(xing)(xing)(xing)1100米(mi)(mi)；百公(gong)里油(you)(you)(you)(you)(you)耗(hao)(hao)(hao)為(wei)10升(sheng)(sheng)的(de)大型(xing)轎(jiao)(jiao)車(che)(che)，每(mei)升(sheng)(sheng)汽(qi)(qi)(qi)(qi)(qi)(qi)油(you)(you)(you)(you)(you)少(shao)行(xing)(xing)(xing)910米(mi)(mi)。