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Check your state licensing board's online database to verify active licenses. Read reviews from multiple platforms, confirm insurance and bonding, get detailed written estimates, and ask about warranty on work. Avoid unlicensed 'handymen' for specialty trade work.

Frequently tripping breakers, flickering lights, outlets that are warm or sparking, burning smells, old wiring (cloth, aluminum, knob-and-tube), insufficient outlets, or any electrical work during renovations. Don't DIY beyond cosmetic fixture replacement.

Professional tune-ups twice yearly: heating in fall, cooling in spring. Change filters every 1-3 months depending on type and usage. Annual maintenance extends equipment life, improves efficiency, and catches problems before failures.

HVAC: 15-20 years. Water heaters: 10-15 years (tank), 20+ years (tankless). Plumbing: 50-80+ years for copper, 25-40 for galvanized. Electrical panels: 30-50 years. Roofs: 20-50 years depending on material. Plan replacements before failure.