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​​© 2018 | Apex Performance Group, Inc.                                                2551 Galena Ave. #2056

CSLB #1033635                                                                                     Simi Valley, California, 93065

We service, maintain, and install Heating and Air Conditioning in Simi Valley, Moorpark, Thousand Oaks,Westlake Village, Newbury Park, Camarillo, Oxnard, Ventura and eastern Los Angeles County.



What is Title 24?

The California Building Standards Code defines the building codes for the state of California. Title 24 of that code defines the energy efficiency standards of the building codes. Since enacted in 1977, the energy commission has reduced electric bills by more than $74 Billion dollars. The standards change over time - and vary by climate location in the state. The standards also differ for commercial and residential applications.


A written construction permit shall be obtained from the enforcement agency prior to the erection, construction, reconstruction, installation, relocation, or alteration of any mechanical system, except as permitted in Appendix Chapter 1, Section 112.2 of the 2007 California Mechanical Code. Projects requiring permits include, but are not limited to: 

  • New HVAC installation 
  • HVAC Changeout 
  • Replacement of furnace, coil, FAU, or condenser 
  • Relocation of an existing HVAC unit
  • Adding or replacing more than 40ft ducting in unconditioned space 


Title 24 specifies different requirements based upon the climate zone of the area:

  • Los Angeles County has zones 6, 8, 9, 14 and 16
  • Santa Barbara County is mostly zone 5, with some 4 and 6
  • Ventura County has zones 6, 9 & 16.

Most of the costal areas around LA and Ventura County is climate zone 6, and inland is climate zone 9.


  1. Heating equipment must have a minimum 80% AFUE (Exception: Wall & floor furnaces; room heaters).
  2. Central air conditioners & heat pumps less than 65,000 Btu/hr must have a minimum 14 SEER.
  3. Newly installed or replaced ducts must have a minimum insulation value of R-4.2. When more than 40 ft of ducting will be installed or replaced, the duct insulation value must be R-6 (CZ 1-10, 12, 13), or R-8 (CZ 11, 14-16). 
  4. A setback type thermostat (24 hr clock with four set points) is required for all alterations.
  5. New or replacement ducts must meet the mandatory requirements of Section 150(m): 

               - All joints and openings in the in the HVAC system must be sealed. 

               - Only UL 181, UL 181A, or UL 181B approved tapes or mastic shall be used to seal duct openings. 

               - Connections of metals ducts and the inner core of flex ducts shall be mechanically fastened. Flex ducts must be connected using a metal


               - Flex ducts that are suspended must be supported every 4ft. max for horizontal runs with no more than 2” of sag between supports and 6 ft.

                     max for vertical runs.

HERS verification is required for all HVAC alterations in all Climate Zones. A HERS rater is a special inspector for the building department. The building inspector may also request to be on site to witness testing by the contractor and/or HERS rater. The installer picks one of the four options on the CF-1R-ALT-HVAC Form that describe the work being conducted. Each option lists the forms required to be at the job site for final inspection. 

DESCRIPTION OF HERS TESTS BELOW (Full descriptions found in Residential Appendix RA3 and Residential Manual)
Duct Sealing – The installer is to insure leakage of the HVAC system is less than 5% for new air conditioning system (new equipment and all new ducts) or 15%, 60% reduction, seal all accessible leaks, etc. for alterations to existing HVAC systems. When the contractor uses the option to seal all accessible leaks, all easily movable objects must be moved to seal existing ducting. New ducting installed by the contractor is not allowed to have any leaks even if it is no longer accessible. In example 3 of the CF-1R “all new ducts” means that all the ducting was changed. The original boots, plenums, etc. do not need to be changed.

Cooling Coil Airflow (CCA) – For new HVAC systems (new equipment and new ducts) the HVAC system must move a minimum 350 CFM of air for each ton of cooling, this applies to both split and package systems.

Refrigerant Charge (RC) – When a new A/C system is installed, the installer is required to verify the charge is correct. This applies when either replacing an existing HVAC unit or installing a new system.

Temperature Measurement Access Holes (TMAH) – Installer must drill and mark holes to measure temperature split.

Hole for the placement of a Static Pressure Probe (HSPP) or Permanently installed Static Pressure Probe (PSPP) – Either the installer must drill and mark holes to measure static pressure or a permanently installed pressure probe must be installed and marked. 

Saturation Temperature Measurement Sensors (STMS) – Permanently installed type K thermocouple are installed on the indoor and outdoor coil so that the HERS rater can verify charge without attaching gauges.  

Fan Watt Draw (FWD) – Installer verifies that the furnace fan watt draw is less than 0.58 Watts/CFM in climate zones 10-15.

Contact us to schedule an appointment at 1.805.206.2739.​