Gary asked:


Neighbor advised me that his HVAC service guy told him to add 1 cup vinegar per month to overflow line in system to prevent build of sludge in water line between outside & inside unit; never heard of this before - any comments?

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JASMINE L asked:


how much mark up do I add on material & equiptment, Also how much do I charge for labor.

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Dilbert asked:


In other words, if you switch it to “ventilation only” the air will go in from the room where it usually comes out into the room, and will be routed to the outside.

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