Beaumont is one of the fastest-growing cities in California, going from roughly 11,000 residents in 2000 to over 60,000 by the early 2020s. That growth happened almost entirely through large planned residential developments - Sundance, Tournament Hills, Fairway Canyon, and dozens of adjacent subdivisions built by national and regional builders during the housing boom. Those homes were constructed to the energy codes in effect at the time, which were less demanding than current Title 24 requirements for Riverside County. A home built in 2005 and never upgraded is now operating on 20-year-old air sealing, with original insulation that has been compressing under years of intense UV exposure and San Gorgonio Pass wind. At 2,500 feet elevation, the sun is stronger than at sea level, and UV degradation of roofing underlayment, caulk, and insulation facings is faster than homeowners typically expect.
The nature of Beaumont's commuter population adds another layer. A large share of residents leave early and return late, meaning the house runs its HVAC with no one home to adjust it. Homes with insufficient insulation and poor air sealing are effectively losing conditioned air all day - the AC cycles repeatedly to maintain temperature in a house that is constantly bleeding cool air through gaps in the envelope. Addressing the attic insulation and the air sealing at penetrations is the most direct way to reduce that continuous loss, and it pays back quickly in a city where summer cooling runs from May through October.