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It usually goes away not because the return has been heated up - how much colder do you set it at night? 20 degress? Then maybe so but most people only set it back about 5 to 8 degrees. This wouldn't trigger the "too cold air intake syndrome". But what does occur is that your furnace hasn't run for a while at night and then you kick it up and after a cycle or two it stops because the furnace heat exchanger is staying warm between cycles. Oh I forgot to ask the key question - Is this a NEW problem or has this always done this?
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