A company installed a new HVAC system 2 weeks ago. The furnace model was new: 58TNOA110C21–20. I initially ordered 58CVA110-20 but they said it will be out of market soon in August. So they installed the new model and said it should be better. 2 days ago, I noticed a low key constant noise from the furnace in the morning around 6:20 am. The noises were loud enough to draw my attention. I went in and opened the furnace door/outer cover and tried to see where the noise comes from. It seems it is from the box where the blower is located, maybe furnace. I am not a mechanic. Then I gently tapped on the covers, the noise stopped. I thought this may be some kind of vibrations. But this morning around the same time, I heard the noise again. I took off the door and tapped the cover over the blower/furnace, the noise stopped. Does anybody have the same problem. I plan to call the installation company after the 4th holiday but just wanted to see if this maybe just a simple thing that can be resolved by myself. Any suggestions?