According to our records, this business is located in Idyllwild (in Riverside County), California 92549, the location GPS coordinates are: 33.744444 (latitude), -116.725833 (longitude). Stronghold Engineering Design is categorized under HVAC Engineering (SIC code 8711). Current estimates show that the unit has a sales volume of $790,000 and staff of approximately 5 people. You can contact the company by phone at (951) 659-0301.