Anyone know why my Mac is running hotter than usual??

I just had it professionally cleaned of dust since its an older model a couple months ago. It isn't running any unusual programs but the fan is kicking into hyperdrive after like 5 minutes now and the bottom is hot to the touch. The hot air is coming up through my keyboard too. I am very concerned since this is super unusual for it.

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Beatbox34 · 31-35, M

If the vents are kicking out the hot air it probably is an indication that the heatsink is not clogged up But however the thermal grease may have dried up if it wasn't replaced.

Given the system is old then the thermal grease needs to be replaced. Try getting that replaced with Arctic MX4 and see if there's any improvement. When the CPU has a lower heat conductivity with the copper heatsink it will heat up hence increasing the airflow to cool the CPU faster. It's running its defense mechanism.