The answer to 'dehumidifier blowing hot air' is that this is a common issue with dehumidifiers and can be caused by a few different factors. The most likely cause is a problem with the compressor or refrigerant system. When a dehumidifier's compressor is not functioning properly, it can cause the air being blown out to feel hot instead of cool and dry.
Other potential causes include a dirty air filter, a blocked air intake or exhaust, or a thermostat issue. In some cases, the dehumidifier may simply be the wrong size for the space, causing it to work harder and blow out hotter air.