High electricity bills point to a poor heating system or bad insulation.

高额的电费账单表明供暖系统较差或者是隔热材料不好。

《柯林斯英汉双解大词典》

You will need to drain the central heating system before you replace the radiator.

你得先把中央供暖系统的水排净再更换散热器。

《牛津词典》

He had the heating system replaced right away.

他马上换了暖气系统。

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A common design looks like a high tunnel.Unlike a greenhouse, which uses a heating system, a hoop house is heated by the warmth of the sun.

VOA: special.2009.12.22

so I'm heating up the system in this path here, and then to connect the 2 endpoints here, a constant temperature path.

需要再用，一个等温过程，这两个状态。

麻省理工公开课 - 热力学与动力学课程节选

And in the winter a heating system will make it warm.

VOA: special.2009.08.21

The council said maintenance work is required on the centre's heating system, roof and kitchen.

BBC: Middleton Centre may be closed by Durham County Council

He put on sweaters and two jackets and remembered that the house had no functioning heating system.

NEWYORKER: Idols

The Scottish Fire and Rescue Service are focusing their investigations on a heating system in the reptile house.

BBC: Five Sisters Zoo fire: Animals dead in blaze