two zone = 1 machine two set of pipes. 不是什么奸商。你不要反应过度。按照空调师傅的建议修就是了。
https://www.arcticac.com/blog/dual-zone-heating-cooling/
Dual-Zone Vs. Dual-Unit
As you consider your HVAC options, you may wonder whether a dual-zone or dual-unit setup is the better choice for your needs. To understand this, you’ll first need to know the key difference between the two. Dual-zone HVAC systems are one unit that’s responsible for heating and cooling different areas of your home. By contrast, dual-unit setups use multiple HVAC systems to meet your comfort demands.
In most cases, a dual-zone HVAC system is the more energy-efficient and cost-effective option. By relying on one heating and cooling system, you minimize maintenance needs and repair requests since you won’t have to worry about caring for multiple units.
