The outside portion of the AC system is the condensing unit. It has two mechanical components that make noise, the compressor and the condenser fan/motor (during heat pump mode this becomes the evaporator). Is your neighbor condensing unit located outside on the opposite side of their master bedroom but on the same side as your master bedroom? This is common practice but with the lots smaller down here it sometimes becomes a problem for the neighbor. I notice in my village neighborhood they switched house layouts left and right frequently but eventually someone ends up with a neighbors condensing unit close to their own master suite. I am sure the developer reverses the front for ascetics but perhaps also for the AC location. Many manufacturers offer insulated compressor jackets that cut down the noise, typically they come with the unit. The condenser fan/motor should not be a problem unless the fan or motor bearing are defective or if they are running their system while your windows are open.
Question:
Are all the new houses coming through with heat pump components on the AC systems? Do they also have electric resistance heat coils too?
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