Heat pumps are essential for efficient heating and cooling, but an unusual smell when starting can indicate various issues. Common causes range from dust accumulation to more serious concerns like electrical problems or refrigerant leaks. Understanding the type of odor can help pinpoint the issue—whether it's a musty smell suggesting mold or a burnt odor indicating electrical faults. Regular maintenance is key to preventing these problems and ensuring your system runs smoothly. Curious about how to troubleshoot or maintain your heat pump? Ask Improvi.ai for personalized guidance!