Several things: Do you have an IR thermometer that you can point at the top coolant hose?
The car's thermometer may be broken and stuck open. Engine will never get to hot and take a long time to warm up. Do not relay on the dash gauge.
If the coolant overflow bottle is empty, not enough coolant in the system to make it to the cabin.
Depending on which system you have, manual or electronic, you may have a loose/mis routed cable or a broken vent damper.
Have you ever changed the cabin filter?
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Keeping it running is better than buying new
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