<xxx> When the air conditioner is set, see that they vacuum the highway. Thus e. As they finish the installation, they must connect such a rubbing thing (a vacuum pump) to the external unit and suck for a while.
<xxx> The better the installers the longer the saucers. Bad ones don’t suck at all.
<yyy> I imagine coming to them and saying "I told you have to suck.. I know nothing anymore."