HVAC Banging after being off for hours?
What could be causing my system to be banging when it is "off" at the thermostat and has been off for hours?
How could it be the delayed ignition or oilcanning, etc when it is off? (And the fan is off too). Or is it something else?
A new e-coil installed last week, could this have anything to do with it?
This is pretty loud banging every few seconds, 40 or more times.