California Air Duct Testers

The Bay Area's #1 Provider of H.E.R.S. Testing & Air Duct LEAKAGE Testing Services.

California Air Duct Testers is a local Bay Area company which specializes in HERS Rating and Title 24 Compliance and verification services for Residential prescriptive HVAC alterations.  We also provide homeowners with an Air Duct Pressure Test for leakage in order to save them money on energy bills.  Please explore our site for more info.

Cities in which we currently perform air duct pressure testing services are:  San Jose, Campbell, Sunnyvale, San Mateo, Santa Clara, Milpitas, Gilroy, Los Gatos, Menlo Park, Santa Cruz, Mountain View, San Carlos, Palo Alto, Los Altos, Redwood City, Portola Valley, Fremont, Burlingame, Cupertino, Belmont, San Leandro, Oakland, Hayward, Castro Valley, Union City, Newark.

Expert Services Provided


Preparation of All Certification Documents

California Air Duct Testers is a local Bay Area company which specializes in HERS Rating and Title 24 Compliance and verification services for Residential prescriptive HVAC alterations.  Cities in which we currently perform air duct pressure testing services are:  San Jose, Campbell, Sunnyvale, San Mateo, Santa Clara, Milpitas, Gilroy, Los Gatos, Menlo Park, Santa Cruz, Mountain View, San Carlos, Palo Alto, Los Altos, Redwood City, Portola Valley, Fremont, Burlingame, Cupertino, Belmont, San Leandro, Oakland, Hayward, Castro Valley, Union City, Newark. HERS RATER, AIR DUCT TESTER

Preparation of all necessary certificates of compliance required by building dept.  Certified by USERA registry.


Duct Leakage Testing

Performed by using the Minneapolis Duct blaster (by The Energy Conservatory or TEC) to pressurize the air ducts and calculate the target leakage rate required for Title 24 compliance purposes.  Required in ALL CLIMATE ZONES in California.  Target of 15% leakage rate in existing duct work (40' or more of new duct work and less that 75% of the ducts have been replaced, and existing ducts are accesible for sealing).  A target of 6%  leakage is required for new (75% or more of the the ducts are replaced and remaining existing ducts are accesible for sealing) or complete replacement of air ducts.

Duct Leakage Testing (Volume Disc)-   For multiple HVAC systems in one job site.

Re-Testing -Duct Leakage Test-   If first Duct Leakage test fails, and all necessary corrections have been taken care of by Licensed HVAC contractor, a discounted rate is applied to re-test if a second appointment needs to be scheduled.

                                             Air Duct Leak Test

                                             Air Duct Leak Test


Leak Detection with fog

    Food grade glycol and water based fog used to locate leaks.

    Food grade glycol and water based fog used to locate leaks.

A fog machine is the best method used for locating leaks when initial Duct Leakage Test fails.  Professional theatrical fog machine is used along with a non-toxic water and food grade glycol based fog. 
*FOR CONTRACTORS- We Highly recommended having an  installer present to seal any leaks found in the air duct system.


Refrigerant Charge Verification

Required in climate zones 2 & 8-15 in the State of California for Title 24 compliance and verification purposes along with Duct Leakage Test, System Airflow Measurement, and Fan Watt Draw Test when new space cooling system is installed or existing space cooling system is altered. The State of California REQUIRES for HERS raters to use digital manifold gauges ONLY.  They are a lot more accurate.

Digital manifold Gauges and digital dual temp thermometer

System Airflow Measurement Test

Required when new space cooling system installed or altered and/or new duct system that provides space cooling is installed, or more than 75% of ducts have been replaced.  The test is performed by either plenum pressure matching or measuring the airflow with the TEC Flow Grid.

TrueFlow Air Handler Flow Meter, or Flow Grid

Fan Efficacy Test

Also known as Fan Watt Draw Test.  Follows same requirement guidelines as System Airflow Measurement.  A target of 0.58watts/cfm of airflow.


Vent Cap System

                       Vent Cap System.  Faster, less waste.

At California Air Duct Testers we take pride in the tools we use.  Amongst them is the Vent Cap System. When the situation is available, they are used to properly seal air duct registers with out the use of tons of adhesive tapes and grill masks.  They help in keeping waste down, and save time.