Windows, Envelope, HVAC and Water Heating

68 answers in 6 groups, each one question with the code behind it.

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Replacing a component is the most common reason a homeowner meets the Energy Code. These pages take one component at a time: what triggers the rules, what a compliant product looks like and which tests or labels the inspector expects.

In this section

Window and door replacement

One window or the whole house, sliding and French doors, exterior doors and skylights.

  1. Do New Windows Need Title 24?
  2. Title 24 Aluminum Windows: Do They Comply?
  3. Title 24 Exterior Door Requirements
  4. Title 24 Skylight Requirements for Homes
  5. Window Replacement Title 24 Checklist
  6. Whole-House Window Replacement: Title 24 Requirements
  7. Replacing One Window: Does Title 24 Apply?
  8. Sliding Glass Door Replacement: Title 24 Requirements
  9. French Door Replacement: Title 24 Requirements
  10. Exterior Door Replacement: Title 24 Requirements
  11. Skylight Replacement: Title 24 Requirements

Labels, glass and shading

NFRC labels, U-factor and SHGC, window film, orientation, overhangs and exterior shading.

  1. Windows in a Wildfire Zone: Vinyl, Aluminum and Title 24
  2. Window Film and Tint: Title 24 Requirements
  3. NFRC Labels and Title 24 Window Approval
  4. What Happens If a Window Has No NFRC Label?
  5. Title 24 U-Factor vs SHGC: Which Number Matters?
  6. Does Window Orientation Matter for Title 24 Compliance?
  7. Do Window Overhangs Help Title 24 Compliance?
  8. Exterior Shading and Title 24 Performance Credit

Roofs, attics and ceilings

Cool roofs, reroofing and insulation, attic and cathedral ceilings, spray foam and radiant barriers.

  1. Title 24 Re-Roofing and Cool Roof Requirements
  2. Are Your Shingles Title 24 Compliant?
  3. Title 24 Insulation Requirements for Homes
  4. Cool Roof Requirements When Reroofing a House
  5. When Does Roof Replacement Trigger Insulation Upgrades?
  6. Attic Insulation Requirements for California Remodels
  7. Cathedral Ceiling Insulation Under the 2025 Energy Code
  8. Vaulted Ceiling Insulation Under the 2025 Energy Code
  9. Spray Foam at the Roof Deck: Title 24 Requirements
  10. Unvented Attic Title 24 Requirements
  11. Radiant Barrier Requirements Under Title 24

Walls and floors

Re-siding and re-stuccoing, crawl space, raised floor and slab requirements.

  1. Which Wall Assembly Meets Title 24?
  2. What Is Quality Insulation Installation (QII)?
  3. Re-Siding a House: Does Title 24 Require Wall Insulation?
  4. Re-Stuccoing a House: Does Title 24 Require Wall Insulation?
  5. Crawl Space Insulation Requirements Under Title 24
  6. Raised Floor Insulation Requirements Under Title 24
  7. Slab Floor Title 24 Requirements for Additions and Conversions

HVAC replacement and ducts

Furnace, air conditioner, heat pump and mini-split replacements, new air conditioning and the rules for ducts.

  1. Does an HVAC Replacement Need Title 24?
  2. Does Replacing an AC Coil or Compressor Trigger Title 24?
  3. What SEER2 Does California Require for a Home AC or Heat Pump?
  4. Title 24 Duct Insulation Requirements
  5. Title 24 Heat Pump Requirements for Homes
  6. Title 24 Water Heater Requirements
  7. Where Can You Install a Heat Pump Water Heater Under Title 24?
  8. Can You Add a Hot Water Recirculation Pump Under Title 24?
  9. Do You Need a Permit to Replace an HVAC System or Water Heater in California?
  10. Title 24 HVAC Load Calculations
  11. Can You Install Electric Baseboard or Wall Heaters Under Title 24?
  12. Furnace Replacement Title 24 Checklist
  13. Air Conditioner Replacement Title 24 Checklist
  14. Heat Pump Replacement Title 24 Checklist
  15. Mini-Split Installation Title 24 Checklist
  16. Adding Air Conditioning to an Existing House: Title 24 Requirements
  17. Duct Replacement 25-Foot Rule Under Title 24
  18. Extending Existing Ducts to an Addition: Title 24 Rules

Testing and ventilation

Duct leakage, refrigerant charge and airflow verification, MERV 13 filters, HRV and ERV and whole-house ventilation fans.

  1. When Is Duct Leakage Testing Required?
  2. What Is Refrigerant Charge Verification?
  3. Whole-House Ventilation Requirements
  4. Title 24 Bathroom Exhaust Fan Requirements
  5. Is Your Range Hood Title 24 Compliant?
  6. Does Title 24 Require a Whole House Fan?
  7. How Many CFM Does the Ventilation Fan Need?
  8. Duct Leakage Testing: When Is It Required Under Title 24?
  9. Refrigerant Charge Verification: When Is It Required?
  10. Airflow Verification: When Is It Required Under Title 24?
  11. MERV 13 Filter Sizing for Title 24
  12. HRV vs ERV for California Title 24 Compliance
  13. Whole-House Ventilation Fan Sizing Under Title 24

For the bigger picture, see everything you need to know about Title 24, the requirements overview and all Title 24 questions.

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