Having a professional HVAC technician replace a blown fuse inside your outdoor AC disconnect box typically costs between $150 and $300 total, combining service diagnostic fees and labor. However, if you choose to replace the fuse yourself as a DIY project, the replacement cartridge fuses cost only $10 to $25 at a local hardware store. Keep in mind that if a new fuse blows immediately upon powering the system back on, it indicates a deeper electrical short or a failing compressor capacitor that requires professional troubleshooting. Verification: Test the new fuse with a multimeter to confirm electrical continuity before turning power back on.
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