When the AC or heating unit doesn’t turn off, it’s usually a problem with the thermostat. As it gets older, for example, an AC/furnace unit still relies on relay switches to maintain the communication between the thermostat and the fan. As time goes by, these switches may become damaged or even unusable, in which case they will prevent that communication entirely. If that happens while the fan is on, then it’s possible for it to stay on, as it no longer receives the command to stop when you turn it off. There are other considerations as well. In case only your AC unit doesn’t turn off, there may be an issue with its condenser coils. Since the AC system relies on the use of a condenser to remove heat from the air, it’s possible that hot air is no longer removed from the air, so the AC becomes stuck in an endless loop trying to keep seeping away heat until it gets confirmation from the thermostat that the target temperature has been reached. It’s also important to check the fan l...
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