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Claim This BusinessDanny's Air Duct Testing Inc. has operated from 400 12th St. Suite 8 in Modesto for more than a decade, completing inspections on over 10,000 houses across the central valley. The family-owned company holds dual certifications with HERS technicians and BPI analysts qualified to conduct the California Title 24 duct leakage testing required during HVAC replacements and new construction. All six customer reviews carry 5-star ratings. Office manager Carolyn and technician Daniel, the owner's son, appear frequently in client feedback for accommodating tight scheduling windows and explaining compliance paperwork in plain language. Service is available Monday through Friday from 7 AM to 8 PM and Saturday from 8 AM to 6 PM.
What distinguishes this contractor is the combination of field testing and regulatory expertise that most residential-focused duct companies do not offer. Danny's Air Duct Testing handles both third-party inspection scheduling and the actual sealing work that brings a home into compliance, eliminating the need to coordinate between separate vendors. Their technicians work directly with contractors building new homes in Discovery Bay, Escalon, and Stockton, as well as individual homeowners replacing aging HVAC systems. The company reports competitive pricing compared with larger regional firms, with customers noting that the test-and-seal process often takes a single afternoon visit.
Shawn L. of Escalon described Daniel arriving on time and completing the duct leak test after an HVAC replacement by Honey's Air, noting that the technician sealed ducts during a return visit to address efficiency losses discovered during the initial assessment. Silvia and Larry M. of Discovery Bay specifically praised the friendly, proficient service and credited the team with making their duct testing process entirely manageable. Pati M. of Stockton reported passing her inspection on the first attempt. V. Lopez highlighted office manager Carolyn's customer service and called the on-site technician super professional and punctual. Roger Loomis noted that the office staff helped his contractor crew navigate Title 24 rules and laws, which he called above and beyond.
Five reviewers gave this company a perfect 5-star rating across Google and the company website. Three customers specifically named an individual technician, with Daniel (the owner's son) handling scheduling and on-site testing for two Escalon-area clients, and office manager Carolyn credited for guiding contractors through Title 24 documentation. All positive mentions cite punctuality, professionalism, and clear communication about testing results.
| Sunday | Closed |
| Monday | 7 AM–8 PM |
| Tuesday | 7 AM–8 PM |
| Wednesday | 7 AM–8 PM |
| ThursdayToday | 7 AM–8 PM |
| Friday | 7 AM–8 PM |
| Saturday | 8 AM–6 PM |
HERS-certified technicians measure air loss through ductwork using calibrated diagnostic equipment to verify Title 24 compliance.
Airflow measurement determines whether conditioned air reaches all rooms efficiently or escapes through unsealed joints.
Technicians seal duct joints and access points to stop conditioned air from escaping into attics or crawl spaces.
Post-replacement duct testing verifies that new HVAC equipment performs within manufacturer specifications after installation.
California state-mandated inspection confirms duct leakage stays below the 10-40 CFM25 threshold required for new construction and HVAC retrofits.
Office staff guides contractors through Title 24 rules, documentation, and inspection scheduling to keep projects on code.