Living in Phoenix means your mobile home’s HVAC system does heavy lifting—especially during triple-digit summers. If your energy bills are climbing or airflow feels weak, damaged ductwork may be the hidden culprit. In this guide, we’ll walk you through how to inspect, repair, and restore ductwork in your mobile home step-by-step, with tips tailored for Arizona’s desert climate.
Need professional help? Our HVAC ductwork repair experts in Phoenix handle everything from leaks to full duct replacements for mobile homes.
Step 1: Turn Off Your HVAC System
Before you begin, shut off your HVAC unit completely. Turn off the thermostat and cut power at the breaker box. This ensures your safety during inspection and repair.
Step 2: Inspect for Common Issues in Mobile Home Ductwork
Mobile homes, especially older units, often have exposed or poorly insulated ductwork. Here’s what to look for:
- Loose or separated joints—common in flex duct connections
- Crushed or sagging sections—restrict airflow and cause inefficiency
- Rodent damage—particularly in crawlspaces or attics
- Worn-out insulation—a big problem in the Phoenix heat
If you’re seeing multiple issues, you may also want to read Signs Your Mobile Home Needs Repair for a broader inspection checklist.
Step 3: Seal Duct Leaks with Mastic or UL 181 Foil Tape
Standard duct tape won’t last in Arizona’s heat—it degrades quickly and loses adhesion.
- Use UL 181-rated foil tape for small gaps or holes
- Apply mastic sealant with a brush for wider cracks
- Seal all visible joints, seams, and connections
Want to go deeper? Our blog on Why Ductwork Matters explains how even small leaks can cost you hundreds in energy waste.
Step 4: Reinforce Connections for Long-Term Durability
Don’t just seal—secure. Phoenix’s expansion and contraction cycles from heat can loosen connections over time.
- For metal ducts, use sheet metal screws
- For flex ducts, wrap with zip ties and clamp with metal bands
- Consider adding support brackets if sagging is a problem
Looking to repair more than just ductwork? Browse our full Mobile Home Repair Services to tackle structural, skirting, and leveling issues too.
Step 5: Replace Crushed or Severely Damaged Sections
If a section of duct is beyond repair (e.g., torn insulation, collapsed flex duct), replacement is the safest option.
- Measure the damaged section and match the diameter
- Disconnect the bad section and insert new duct
- Seal and insulate the new section properly
- Ensure proper slope for drainage in case of condensation
When in doubt, call a local pro. Our HVAC team in Phoenix specializes in fast, affordable mobile home duct replacement.
Step 6: Reinsulate the Ducts to Survive Phoenix Summers
In a Phoenix mobile home attic, summer temps can soar above 150°F. Exposed ductwork here means lost energy.
- Use R-8 insulation or higher, rated for high-heat climates
- Wrap tightly and secure with foil tape
- Avoid compression—it reduces insulation effectiveness
Insulation isn’t just for comfort—it plays a major role in HVAC efficiency. See how this ties into your overall mobile home energy-saving strategy.
Phoenix-Specific HVAC Repair Tips
- Avoid midday repairs in summer—attics and crawlspaces become dangerously hot
- Watch for UV damage on outdoor ducts or rooftop units
- Use desert-grade materials rated for high UV and thermal resistance
- Check local rebates through APS or SRP for duct sealing programs
When to Call a Mobile Home HVAC Contractor in Phoenix
DIY isn’t always the answer. Call a pro if:
- Ductwork is buried in walls or floors
- You detect mold, asbestos, or fire hazards
- Your HVAC system is short cycling or blowing warm air
For full-service help, explore our HVAC repair services or request a custom estimate via our contact page.
Save Money with Local HVAC Cost Transparency
Want to estimate your project budget? Our Mobile Home HVAC Cost Guide breaks down common repairs, replacements, and upgrade costs in Arizona—so there are no surprises.
FAQ: Ductwork Repair for Phoenix Mobile Homes
What’s the best tape for HVAC ductwork in high heat?
UL 181-rated foil tape or mastic sealant. Never use standard duct tape.
How do I know if my ductwork is leaking?
Listen for hissing sounds, check for dust buildup near vents, or conduct a smoke test.
Can I repair my ductwork myself?
Yes, minor repairs are DIY-friendly. For full replacements or safety concerns, hire a professional.