Houston Flooding and Your AC: What to Do After Water Damage
Updated January 2026
If floodwater submerged your outdoor AC unit, do not turn it on. Mud, debris and contaminated water inside electrical components create fire risk and will destroy your compressor if the system runs. A professional inspection ($150–$300) determines whether your unit is salvageable or needs replacement. Systems submerged above the electrical connections are usually totaled — insurance may cover replacement at $4,500–$12,000.
Immediate Steps After Flooding
1. Turn off all power to the HVAC system
Flip the HVAC breaker in your electrical panel to OFF. Also flip the disconnect switch near the outdoor unit to OFF. Do not restore power until a licensed tech inspects the system.
2. Document everything for insurance
Photograph the water line on your outdoor unit, any visible mud or debris inside, and the serial/model number plate. Your insurance adjuster needs this. Most homeowner policies cover flood damage if you have separate flood insurance (standard policies exclude flood).
3. Don't hose it out yourself
Spraying water into an already-damaged unit doesn't help and can push mud deeper into electrical connections. Let a tech disassemble and clean properly — or condemn it if water reached the compressor electrical terminals.
4. Call a licensed HVAC tech for inspection
Flood inspection: $150–$300. They'll check electrical connections, contactor condition, capacitor integrity, compressor windings and refrigerant charge. Expect long wait times after major flooding events — every HVAC company in Houston gets slammed simultaneously.
Salvageable vs Totaled
Possibly Salvageable
- • Water stayed below the electrical disconnect
- • Unit was submerged less than 6 hours
- • Clean rainwater (not sewage/bayou overflow)
- • System under 8 years old with good maintenance history
Estimated repair: $300–$1,200 for cleaning, electrical testing and component replacement
Likely Totaled
- • Water reached compressor electrical terminals
- • Submerged more than 12 hours
- • Contaminated water (sewage, bayou, chemical)
- • System already over 12 years old
- • Mud packed inside the unit
Replacement: $4,500–$12,000. Consider elevating the new unit 12–18 inches on a concrete pad ($200–$400 extra).
Preventing Future Flood Damage
If you're replacing a flood-damaged unit or installing new, elevate the outdoor condenser 12–18 inches above grade on a reinforced concrete pad. This costs $200–$400 during installation and protects against the 6–12 inches of standing water that hits many Houston neighborhoods during heavy rain events. Not a guarantee against major flooding, but it handles the routine stuff.
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