How To Passively Cool Your Home in the Summer

When temperatures soar in Summer, it’s tempting to crank up the air conditioning. Unfortunately, that can mean skyrocketing energy bills for you and a negative impact on the planet. Here’s the good news! This list of passive cooling ideas can offer you some smart solutions to minimize the effect on your wallet while cutting down on energy usage.

These ideas rely on natural ventilation, shading, smart design, and simple daily habits. They’re perfect whether you rent or own, and they keep you comfortable while cutting down on energy use.

1. Window Coverings

Sunlight pouring through your windows is a major source of indoor heat gain. Block it before it enters:

• Use blackout curtains or thermal shades on south- and west-facing windows.
• Install bamboo blinds or reflective window film to reduce solar heat.
• Close curtains during the hottest part of the day and open them at night to release trapped heat.

Eco Conscious Tip: Choose energy-efficient window coverings made from natural fibers or recycled materials.

2. Cross Ventilation

Take advantage of natural airflow to push hot air out and bring cooler air in:

• Open windows on opposite sides of your home to create a cross-breeze.
• Use a box fan or window fan to direct airflow outward on the hot side and inward on the cooler side.
• Open upper-level windows to allow rising warm air to escape.

Eco Conscious Tip: Open windows or doors in the morning or evening when temps are lower.

3. Roof Hacks

If you intend to replace your roof soon, consider these ideas. Your roof absorbs lots of heat. Design your roof to reflect heat instead:

• Paint your roof with reflective “cool roof” coatings. While there is a decent amount of evidence that these coatings are effective, you will want to research the right product for you. There are water-based, low VOC options available!
• Use white tarps or reflective panels for temporary cooling.
• If re-roofing, choose light-colored or sustainable heat-reflecting roofing materials.

Eco Conscious Tip: Consider “green roof” options that use plants or moss. This can add significant weight to your roof, so consult a structural engineer to ensure it is safe to install.

4. Shade Outside of Your Home

Stop heat at the source by shading the exterior:

• Install awnings, pergolas, or shade sails over windows and patios.
• Plant deciduous trees or tall shrubs where they will shade sunny windows.
• Add vertical trellises with fast-growing vines for living shade.

Eco Conscious Tip: Greenery helps reduce the urban heat island effect. Visit your local (Central Ohio) native nursery to purchase a wildlife supportive shade tree or a showy native vine. Purple Passionflower (Passiflora incarnata) is a beautiful option for a vine trellis.

5. Switch to Low-Heat Lighting and Appliances

Electronics and lights give off heat even when idle:

• Replace incandescent bulbs with LEDs, which emit less heat.
• Cook with small appliances or outdoors whenever possible.
• Unplug electronics when not in use to reduce phantom loads.

Eco Conscious Tip: Smart power strips are a newer option that offer features well beyond the traditional power strip. Smart power strips can monitor and automate routines that turn off power to your devices when they’re not in use.

6. Install an Attic Fan or Vent

Hot air builds up fast in attics. Let it escape:

• Passive ridge vents or gable vents allow natural hot air to freely escape your attic.
• Solar-powered attic fans are a thing! YEAH! Solar-powered attic fans push out heat using solar energy.

Eco Conscious Tip: Solar fans may qualify for energy rebates.

7. Use Thermal Mass to Your Advantage

Thermal mass refers to a material’s ability to absorb, store, and release heat energy which helps moderate temperature. Materials like concrete, brick, water, and stone can regulate temperature naturally:

• Leave tile or stone floors exposed during hot months.
• Use indoor water features to absorb and release heat.
• Paint walls in low VOC, light-reflective colors to prevent heat absorption.

Eco Conscious Tip: Light-colored décor helps absorb less heat indoors.

8. Create a Cool-Down Routine

Daily habits are important too:

• Open windows at night to let in cool air, then close them by mid-morning.
• Sleep on the lower level of your home if the upper level becomes uncomfortable.
• Hang a damp sheet in front of an open window or fan for natural evaporative cooling.
• Place a bowl of ice in front of a fan for a quick DIY old-school “air conditioner”.
• Use ceiling fans set to spin counterclockwise to push cooler air down.
• Light-colored or natural fiber rugs can help reduce heat transfer.
• Close doors to unused rooms during hottest times of the day.

Eco Conscious Tip: Consider using buckwheat, millet, or kapok pillow for your bed. All three types regulate temperature well with varying levels of support.

Final Thoughts

Cooling your home doesn’t have to cost a fortune or negatively impact the planet. Our passive cooling ideas are easy, eco-conscious, and can help you reduce energy bills over the short and long term. Whether you’re making small daily changes or planning larger green home improvements, every step makes a difference.

We’d love to hear from you! Have these tips helped you beat the heat this summer? Do you have your own favorite passive cooling ideas to share? Let us know in the comments section.

Simply Living is a nonprofit organization based in Central Ohio, serving communities within a 60-mile radius of Columbus. Since 1992, we’ve been empowering people to live sustainably and simply through education, connection, and action. If you value our mission and programs, we invite you to support our work by becoming a member, making a donation, or volunteering with us. Together, we’re growing a more connected, resilient, and regenerative Central Ohio.