在空調機系統中，結合變頻式壓縮機與可調變開口度之膨脹裝置作為致動器，藉由挑選適當的控制參數進行迴授控制，可有效地改善運轉效率與性能。而若挑選之控制參數不佳，則可能導致比傳統定頻空調機控制之下更差的性能。本研究中，我們針對空調機系統運轉於暖氣模式下進行探討。採用既有之內、外迴圈串聯控制架構，分別對於冷凝器過熱調變(CSR)與蒸發器過熱調變(ESR)兩種控制架構，進行控制實驗。由實驗結果中，可發現ESR與CSR兩種控制架構，分別在暫態以及穩態響應上，有較佳之實驗結果。為了使系統能同時擁有省電與急暖之優良性能，我們結合上述兩種控制架構，進行控制器切換之實驗。於暫態時採用ESR控制器，待系統趨於穩態時，切換至CSR控制器。同時我們引入了無顛簸補償器(Bumpless Compensator)以補償控制器切換時，致動器因狀態誤差累積過多時，可能產生之劇烈變化。

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