I just installed a RUUD 18seer/9.4 hspf heat pump on a Ruud mod furnace, I love the 2 stage cooling with dehumid but it was cool here this weekend and the heat pump kicked in, the line set was fastened to the ductwork and there was enough vibration in the line set to rattle my vents! Is considerable vibration in the linset normal on heating operation?
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