Energy Expert Warns: The Wrong Type of Summer Curtains Could Be Driving Your AC Bills UP
When temperatures soar, most homeowners instinctively pull their curtains shut to block the blazing sun. While this seems smart, the type of curtains you use—and how you use them—can make or break your home’s cooling efficiency.
According to energy expert Corey Gilgan, Owner of Oregon Generators, many people unknowingly choose materials and habits that force their air conditioners to work harder.
“I see homeowners making the same mistakes when I’m working on electrical systems in homes across Portland,” Gilgan says. “They’ll have heavy, dark curtains that aren’t doing them any favors, or they’ll keep them closed all day even when the sun has moved away from that side of the house.”
The key, Gilgan explains, is understanding which fabrics and timing strategies actually keep your home cooler—so you don’t throw money away on higher electricity bills.
The Science Behind “Heat Pockets”
Heavy or dark-colored curtains may look stylish, but they often create a hidden problem: heat pockets.
When dark fabrics cover sun-facing windows, they absorb rather than reflect heat. This trapped heat lingers between the fabric and the glass, turning your curtain into a mini furnace. Instead of helping, this buildup increases the load on your AC system.
“Think of the difference between wearing a black shirt versus a white shirt in the sun,” Gilgan explains. “The black shirt absorbs heat, while the white one reflects it away. Your curtains work the same way.”
The result? Higher indoor temperatures, an overworked cooling system, and energy costs that climb when they could be dropping.
4 Smart Curtain Hacks to Cut Cooling Costs
Gilgan recommends these practical upgrades to help your curtains work with your AC system instead of against it:
1. Choose Light Colors and Reflective Materials
Swap heavy, dark drapes for light-colored or reflective curtains. White, cream, or thermal curtains with reflective backing can bounce sunlight away instead of trapping it inside.
2. Master Strategic Timing
Timing is everything. Close curtains on east-facing windows in the morning, south-facing at midday, and west-facing in the afternoon. Reopen them as soon as the sun moves on to prevent unnecessary heat buildup while still enjoying natural light.
3. Layer for Flexibility
Use sheer curtains during the day to diffuse light without heat absorption, then draw heavier curtains only when you need privacy at night. This layered approach keeps rooms cooler without sacrificing comfort.
4. Upgrade to Energy-Smart Designs
If you’re still using old drapes, consider investing in thermal or cellular shades. These modern designs are built for energy efficiency, offering better insulation and reflection than traditional fabrics.
Why Small Choices Matter
“When I’m installing electrical systems in homes, I always notice how different curtain choices affect indoor temperatures,” Gilgan says. “People often stick with whatever came with the house or choose based on looks alone, without thinking about energy efficiency.”
He adds that homeowners can reduce AC usage by 10–15% just by switching to lighter, reflective curtains and adjusting when they close them.
“You don’t need to spend a fortune on fancy equipment,” he notes. “Sometimes it’s just about making smarter choices with what you already have.”
The Bottom Line
Curtains may seem like a simple design choice, but the wrong fabric or poor timing can quietly drain your wallet every summer. By switching to light, reflective materials and learning when to open or close them, you’ll help your AC run more efficiently and save real money on your electricity bills.
It’s one of the easiest, most cost-effective energy upgrades you can make—no contractor required.
About Oregon Generators
Oregon Generators provides expert installation, maintenance, and repair of residential and commercial generators, specializing in Generac and Kohler systems. Their team also offers EV charging setups and electrical panel upgrades across the greater Portland area. Known for exceptional customer service, Oregon Generators is committed to helping homeowners and businesses stay powered and efficient year-round.
