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How Summer Heat Affects Your Windows — and Your LADWP Bill

  • 1 day ago
  • 2 min read

a photorealistic close-up interior photograph of a standard double-hung window in a Southern California home — vinyl or painted wood frame, clear glass, warm afternoon sunlight streaming through, visible on the interior wall and floor. Real residential window, not architectural.

If your home feels warmer than it should in June, your windows may be working against you.


In Southern California, summer heat is a design problem. Temperatures regularly exceed 90°F in the Santa Clarita Valley, and homes built decades ago were not designed to the energy efficiency standards that make a real difference in today's utility bills.


Windows can significantly affect your LADWP bill during the summer months.


Summer Windows and your LADWP Bill


Summer Windows can account for 25–30% of residential cooling energy use. In summer, older single-pane windows allow significant solar heat gain into the home, forcing your AC to work harder every day. For homeowners in Los Angeles, Santa Clarita, Newhall, and the San Fernando Valley, that can mean $100–200 in additional costs to your LADWP bill per month.


What energy efficient windows do to your LADWP Bill


Modern energy efficient windows are rated by two key metrics:


  • U-factor: how much heat passes through the window overall. Lower is better.

  • Solar Heat Gain Coefficient (SHGC): how much solar radiation enters through the glass. In Southern California's climate, a low SHGC is particularly valuable.


Dual-pane windows with a low-E coating reflect a significant portion of solar radiation before it enters your home.


Windows affect your LADWP bill during summer months


  • One room consistently runs 8–10°F hotter than others in the afternoon

  • Your AC runs nearly continuously but the house never quite cools down

  • You notice heat coming through the glass or drafts around the frame in warmer months


LADWP rebates for window upgrades


LADWP offers rebates for qualifying window replacements. Most homeowners are not aware these programs exist. Ask us about eligibility when you call — before signing any contract.


Ready to find out whether your windows are costing you this summer? Construction Concern offers free in-home estimates for homeowners in Los Angeles, Santa Clarita, Newhall, and throughout Ventura County.



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