Why do Tents Get So Hot?
Trying to sleep in a tent cum furnace is rarely fun, but why do these thin shelters get so warm? and how what can you do to help keep them cool?
Issues with Tent Overheating?
You’re in the right place! In this guide, we will be covering the following:
- Why do tents get so warm during the day?
- Why do tents get so warm at night?
- Tips to help prevent overheating
One of the greatest fears of many newbie campers is freezing to death while out trying to catch their kip in the wilds. In reality, however, most experienced campers know that overheated tents are a far more common problem than underheated ones.
But why is this the case?
Below, we offer a short, straightforward explanation as to why our tents get so hot along with a handful of handy tips to help you keep things cool inside your backcountry crib.
…and if all else fails, you can always check out our guide to the best tent fans.
The main cause of daytime overheating in your tent is simple: the sun…
…or, in technical parlance, solar gain—the increase in thermal energy in any space or structure as a result of it absorbing solar radiation, i.e. sunlight.
In short, tent fabric allows most solar wavelengths to pass through and heat up the inside of your tent. This creates a kind of Greenhouse effect, with heat coming in but having limited means of getting back out.
How to Prevent Daytime Overheating
To avoid your tent turning into a sweltering torture chamber during the daytime, take the following steps:
- Make use of natural shade from trees and bushes
- Open all ventilation zips
- Maximize airflow when pitching your tent by ensuring there is a gap between the tent body and fly
- Leave the rainfly off if there’s no risk of rain
- Buy a lighter-colored tent—dark colors absorb more energy from UV radiation
- Wait until sundown to pitch your tent
- Suspend a tarp above your tent to provide shade instead of using a rainfly
The main source of nighttime overheating is not anything outside your tent but, rather, what’s inside it: humans.
We humans naturally heat our bodies to an average temperature of 98.6° Fahrenheit, which is normally much warmer than the temperature of the ambient air that surrounds us. While outside temps cool down as the day progresses, our body heat and the warm air from our breathing essentially cancel out that decrease in temperature and can leave things a little bit stuffy inside our tent without adequate ventilation.
How to Avoid Nighttime Overheating
The first step to ensuring your tent isn’t intolerably toasty in the evening is to make sure it is well ventilated in the evening. On particularly hot days, the sun can heat up the inside and contents of your tent and the stored heat or “thermal mass” will release slowly after sundown.
Other tips that can help reduce nighttime overheating include:
- Ditch the rainfly if the skies are clear and forecasts are good
- Opt for a larger tent—smaller tents maximize thermal efficiency; big ones do the opposite
- Store your gear outside your tent so your body heat is dispersed throughout more cubic footage
Other Tips for Staying Cool in Your Tent
1. Pitch your tent near a river or lake to take advantage of the cooler air.
2. Take a dip before bedtime to lower your core temperature.
3. Reflect heat away from your tent by laying reflective thermal survival blankets on the tent wall most exposed to the sun.
4. Bring along a camping cooler if car camping or not venturing too far from the roadside.
5. If backcountry camping, hike into higher ground—where temps will be lower—before pitching your tent.