The answer to 'heat pump blowing hot air' is that a heat pump blowing hot air instead of cool air is usually a sign of a problem with the system. Common causes include a refrigerant leak, a malfunctioning reversing valve, or an issue with the compressor. The heat pump may be stuck in heating mode or unable to properly switch to cooling mode.
If your heat pump is blowing hot air when you expect it to be cooling, the first step is to check the thermostat settings to ensure it's set to 'cool' mode. You'll also want to listen for any unusual noises coming from the outdoor unit, which could indicate a mechanical issue. If the problem persists, it's best to call in an HVAC professional to diagnose and repair the issue, as attempting DIY repairs on a heat pump system can be dangerous.