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The heat exchanger in a mid efficiency furnace is intended to transfer heat from the

  1. outdoor air to the indoor air

  2. indoor air to the outdoor air

  3. combustion chamber to the circulating air

  4. circulating air to the combustion chamber

The correct answer is: combustion chamber to the circulating air

The heat exchanger is a critical component in a furnace that transfers heat from one source to another. In a mid efficiency furnace, the heat exchanger's purpose is to transfer heat from the hot air produced in the combustion chamber to the circulating air. This ensures that the heated air is distributed throughout the home and not lost to the outside. Option A is incorrect because it suggests that the heat exchanger would be transferring heat from the cooler outdoor air to the warmer indoor air, which is not an efficient use of energy. Option B is also incorrect because it would be counterproductive to transfer already heated indoor air back outside. Option D is incorrect because it implies that the heat exchanger would be transferring heat from the already heated circulating air back into the combustion chamber, which would not be an effective use of the heat.