Understanding the California
HERS Requirements
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This page covers alterations to existing homes only.
D&H Climate Control™
HERS Rater
HERS Rater Certification #: CC2004475
C-20 Lic. # 655520

Field Verification and Diagnostic Testing Guide
When is a HERS Rater required ?
Always check with your local building department.
They may require above and beyond the State minimums described here.


Which cities require HERS Rater Field verification of refrigerant charge measurement or a CID (Charge Indicator Display) before I can get Final inspection?

The California Energy Commision divided the state up into different climate zones.
First you need to find out which climate zone you are working in.
Click here to download the list of cities and zones in pdf format.
The 2008 Standards state that when new or replacement split system air conditioners, heat pumps, air handlers, or heat exchangers are installed in existing buildings, a refrigerant charge measurement or a CID (Charge Indicator Display) is required.
This applies in climate zones 2, 8, 9, 10, 11, 12, 13, 14, and 15.
As of January 1 2010 there are no longer alternatives to refrigerant charge measurement and TXV verification is gone. TXV verification has been replaced by CID (Charge Indicator Display) installation and verification

If you do not know the correct procedures for the required HERS tests, download this Reference Appendices (Section RA3).
Inside you will learn how to preform the contractor's tests for filling out the CF-6R-MECH-xx-HERS forms.

Click here to download the CF forms you will need for Refrigerant charge Verification
The installer is to fill out and provide a CF-6R-MECH-25-HERS page to HERS rater and Building officials when a changout is made. (PDF file). Posted: August 2009.

So you have downloaded the forms and printed them. Now you are even more confused. That's OK because here are simple step by step instructions to guide you through them.


As I said before, the California Energy Commision divided the state up into different climate zones. First you need to find out which climate zone you are working in.
Click here to download the list of cities and zones in pdf format.
The 2008 Standards state that an existing duct system must be sealed and verified by a HERS Rater when portions of the heating and cooling system are altered.
This applies in climate zones 2, 9, 10, 11, 12, 13, 14, 15, and 16 in any of the following scenarios:
  • If an air handler is installed or replaced (this includes package units).
  • If a cooling or heating coil is installed or replaced.
  • If you add more than 40 feet of new duct to the system.
  • If a furnace heat exchanger is installed or replaced.
  • If a heat pump or air conditioner condensing unit is installed or replaced.
There are of course exceptions to the above scenarios:
  • Ducts sealed or insulated with asbestos are exempt.
  • Duct systems with less than 40 linear feet of duct in unconditioned space are exempt.
  • Duct systems that have prevously been sealed, tested and certified by a HERS rater are exempt.
  • Still Confused? These flow charts should help

Click here to download the CF-6R-MECH-xx-HERS form you will need when conducting a duct pressurization test for changout.
The installer is to seal and test the duct then fill out and provide this page to HERS rater and Building officials when a changout is made. (PDF file).

Have your system checked for leaks because
if it doesn't heat you up
or cool you down
it just blows.

D&H Climate Control™ brings over 15 years of on the job HVAC experience for your HERS Rating needs. Experience makes all the difference when you need the job done right.
HERS Rating by D&H Climate Control™

D&H Climate Control™
19014 Canyon Meadows Drive,
Trabuco Canyon   California  92679
Tel: 949.766.8925   Fax: 949.766.8925
C-20 Lic. # 655520
HERS Rater Certification #: CC2004475