I've been hearing a weird noise coming from my furnace over the last couple of nights. My house typically cools off enough overnight that the A/C doesn't kick in until around 2 in the afternoon at which point it runs pretty consistently until around 10pm to cool the house down to around 22c. Around 7 or so in the evening I start to hear a rattling noise coming from the furnace. It kind of sounds like something is in the duct and is floating in the air flow bouncing off the ducting walls. Anyone know what could be going on?
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